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I am attempting to build a small 4xAA USB charger to use while on long flights so that I can watch movies. I notice that the wall charger is rated 5v 1000ma. I wonder if anyone has any clue what the Kaiser draws at full processor load. I can make a 4x AA charger with a 1000ma capacity, but if i could get away with something like a Minty Charger(2xAA, maybe like 500ma), I would, as the plans are there, and it would save me 15 bucks for a switching voltage regulator.
Has anyone done any work to this effect, and would they mind sharing their measurements?
Thank you in advance,
Ben
use batterystatus and check consumption when watching a movie or something
I will certainly check that, thanks!
Also does anyone know whether the kaiser has and odd charging tendedcies?
My plan basically calls for 4 aa batts wired in series to provide 6v, into a 5v switching voltage regulator, and out to USB. Will this be something that will work, or are there any odd little caveats i need to worry about?
Ben
The USB spec calls for a max of 500mA at 5V. Since the Kaiser can charge off of USB, then that should work.
I have a back ground in basic electronics, and building something like this would be right up my ally. But when I can find just what you want at a price like this>>
http://www.thepocketsolution.com/PSI-42555.html
I can't see any reason to bother building my own. I use this vary one, for just the same reasons you want one. And it works great.
GWelker62 said:
I have a back ground in basic electronics, and building something like this would be right up my ally. But when I can find just what you want at a price like this>>
http://www.thepocketsolution.com/PSI-42555.html
I can't see any reason to bother building my own. I use this vary one, for just the same reasons you want one. And it works great.
Click to expand...
Click to collapse
Wow! I suppose I should have done a little more research first That charger costs the same as a decent switching voltage regulator.
Does that thing look like it's easy to open up? I may wish to modify it slightly so that I can charge other USB devices off it. I also probably want to repackage it into something fun.
Thanks for letting me know about this charger... You have saved me a lot of soldering
Ben
edit:
http://www.thepocketsolution.com/PSI-36223.html
I'm scratching my head re this one. The tilt and the kaiser are, with very few exceptions the same phone. I would imagine that the battery chargers here are the same too, though this one is a couple bucks cheaper. The AAA model is only 10 bucks... I imagine that all these things are is a voltage regulator and an LED... if i am gonna rip one apart anyways, is there any reason i couldnt get the AAA model, tear it up, jack 4 AA batteries to it, and get all the benefits of the 15 dollar model, for 10? Im not really penny pinching, though if i decide to repackage the whole deal anyways, might as well save the 5 bucks and buy a USB jack
ben
with the cost of geting the parts, you can buy one for about USD 10.
kms
You might want to check that giving the phone 5 volts will actually put it into charge mode. I believe the mot razar won't charge off the USB unless it first communicates with the computer. Don't know though, I only borrowed the phone for a week when traveling for work.
As for power consumption, I took a 10 hour trip yesterday. Bought a USB car charger and used the data cable that came with the phone. I plugged it in and it went into charge mode. Running tomtom and such didn't charge the battery to any meaningful extent while it was plugged in. Fortunately, it didn't drain the battery either.
Maybe the phone knows the diff between USB and an OEM charger, and draws power accordingly (500mA for usb, 1 amp for OEM charger).
Edit: the car usb thing I picked up is rated for 5v +-.5 volt and 1 amp output (says the sticker anyway). Does the job I was hoping for and was cheap (6 bucks at fry's).
Nice!
I think im gonna order 2 of the battery chargers linked above. one i will keep stock (i leave for spain in a few weeks and need one to work)
the other i will rip apart and see if i can do something fun and exiting with it. I think i have an empty altoids box around somewhere.... the one i used to hide smokes from the parents in when I was a kid....
I like breaking stuff!
Ben
Note that the Tytn II's charge circuitry may require more than 500 mA if the battery is sufficiently discharged. In such conditions, a 500 mA charging current won't actually charge the battery. A 1000 mA charging circuit should be sufficient, as that matches the device's rating as specified in the manual.
Be real careful..
Be careful taking any home built electronics on a plane in these days since 9/11.
A girl in USA got done for having a battery and LED on her t-shirt in an airport and wasnt even flying...
id be amazed if you were allowed to take a home-built circuit onto a plane, esp. in the USA
just saying
g
pontifex33 said:
edit:
http://www.thepocketsolution.com/PSI-36223.html
I'm scratching my head re this one. The tilt and the kaiser are, with very few exceptions the same phone. I would imagine that the battery chargers here are the same too, though this one is a couple bucks cheaper. The AAA model is only 10 bucks... I imagine that all these things are is a voltage regulator and an LED... if i am gonna rip one apart anyways, is there any reason i couldnt get the AAA model, tear it up, jack 4 AA batteries to it, and get all the benefits of the 15 dollar model, for 10? Im not really penny pinching, though if i decide to repackage the whole deal anyways, might as well save the 5 bucks and buy a USB jack
ben
Click to expand...
Click to collapse
I can't see any difference in these two. I've had this one for over a year and half. I used on the 8125, the 8525, and now the Tilt.
As far as a AAA ver a AA, since the voltage is the same between the two, then it is only a question of mAh capacity.
I have one thing to say if your coming into America with some home made electronics your going to be thrown in Jail ...
ripnetuk said:
Be careful taking any home built electronics on a plane in these days since 9/11.
A girl in USA got done for having a battery and LED on her t-shirt in an airport and wasnt even flying...
id be amazed if you were allowed to take a home-built circuit onto a plane, esp. in the USA
just saying
g
Click to expand...
Click to collapse
I've actually taken a suitcase full of half built circuit boards and electrical components as carry on (half finished school project). They didn't even raise an eyebrow. As long as it isn't connected to something that looks like a bomb, I don't think they care.
thanks, i surmised that based on some other devices i have. I'm not too concerned as the battery will never (hopefully) get critically low. I'd like to jsut keep the thing running for ~9 hours while running either GPS or a movie... I hate plane rides, and i need something to do to entertain myself. I'll see what the charger mentioned above can put out. I just ordered two, and we'll see what it looks like... I'll write a review when i have had time to play with it a bit.
I've had Archos portables for years and it also has a 5V input. A simple 4 cell pack using 2300-2900 NiHi AA batteries in series will easily power these devices for over 10 hours straight. What's nice is that you don't need any regulator at all, just don't use alkaline batteries in it as you'll be at 6V. I carry a very small 4-cell charger to charge the cells. Works great for long travel. I took an iPod version with battery fuel gague, stripped out their power supply and just kept the power switch and fuel gague circuit. This costs more but works really well and looks good too.
So this thread is of some use to others: here are some data that i collected regarding current draw:
Locked with the screen off, no apps running: 1-4ma
TCMP playing a movie fullscreen: never more than 350ma
TCMP Playing in background with tomtom navigator 6 running: 416ma
all done in flight mode with the backlight set to the middle.
Can you you do a worst case test for current draw?
Turn on GPS, bluetooth, Wifi, backlight max and not flight mode.
I'm looking for a backup battery. Has anyone come across any that have enough juice to put a good charge on the nook? I know those little 400mah batteries can charge the nook but how long will 400mah last? I'm looking for something that can give it a 50%+ charge
This what you are looking for? That would get you about 1.5 charges.
This would give you about 1 charge.
The Zagg one would be perfect but its $100! I dont want to spend over $50 guess I should have said that.
I will look into the other one you posted thanks
EDIT: The energizer one looks great!! I am probably going to order one. Thanks a lot!
I didn't notice an amp output on the energizer. NC is looking for 1900 mA for proper charging. That first gizmo is dead perfect but 100 beans is a bit outside my budget too. I have a 4400 mah battery that does 1000 mA output- i wonder if that would add a few hours to my NC? I take very long flights often.
Sent from my Nookcolor
markiejones said:
I didn't notice an amp output on the energizer. NC is looking for 1900 mA for proper charging. That first gizmo is dead perfect but 100 beans is a bit outside my budget too. I have a 4400 mah battery that does 1000 mA output- i wonder if that would add a few hours to my NC? I take very long flights often.
Sent from my Nookcolor
Click to expand...
Click to collapse
If I remember right The stock nook color charger is rated at 1.9A which is 1950mah. The energizer website lists the battery linked above as 1750mah which should work great.
Check out Brunton Chargers:
http://www.rei.com/category/40006509
I went with this unit, http://www.amazon.com/gp/product/B0038VQET4/ref=oss_product
It's under $40 and provides a full charge.
What is the recommended way to test the time-to-charge? There are two issues that I see in capturing this data.
1) You really shouldn't run the thing dry - I mean it won't even boot with the power adapter plugged in until it has a little juice in the battery. I suppose youl could to drain it to 25% then charge from there. Then add 25% to whatever your time-to-full is?
2) how can you tell how long this thing takes to charge if you're asleep. Is there a log file which gets updated with charging events? Or some specific app for such things?
A little big but if you want to keep your mobile devices running for a long time try this:
http://www.amazon.com/gp/product/B003ZBZ64Q/ref=oss_product
It charges my NC and G2 3 times each and change. Especially useful when using the wireless tethering on the G2 to keep the NC online.
I've been running my NC entirely from a Tekkeon MyPower MP3450 with the MP3450-10 add-on pack for two full days of heavy usage (probably around 18 hours or so of actual use) and the MyPower is only drained down half-way while keeping the NC topped off at 100%. I'll be back with an update in another couple of days when I expect it to be empty.
Edit: Yep, I got four days of heavy usage (probably equivalent to four full recharges of the NC) from the Tekkeon pack. I bought it to keep my laptop running on long flights, but it's nice to know I'll be able to read if the power goes out for a few days.
Will using a standard usb cable with these backup batteries still only charge at .5A? If I use the stock nc cable on the energizer battery linked above will it damage the battery?
Have you looked at Monoprice? They have battery backups. I haven't personally ordered one of these (yet...need one for my evo) but I've ordered lots of stuff from them and everything has worked very well.
2800 maH
1900 maH
jerrykur said:
I went with this unit, http://www.amazon.com/gp/product/B0038VQET4/ref=oss_product
It's under $40 and provides a full charge.
Click to expand...
Click to collapse
That's a decent price. Have you had much of a chance to test the unit?
With the NC's built-in battery rated at 4000 mAh, this battery should be able to completely recharge an NC. Or give you an additional ~8+ power-on hours.
johnny15 said:
Have you looked at Monoprice? They have battery backups. I haven't personally ordered one of these (yet...need one for my evo) but I've ordered lots of stuff from them and everything has worked very well.
Click to expand...
Click to collapse
I have a version of one of those, works fine except it's hard to keep in place. If you get one, also get a M-F cable as well.
I went with THIS deal to get THIS battery pack for free. Not expecting much, but will post back when I have some results.
Eascen said:
I have a version of one of those, works fine except it's hard to keep in place. If you get one, also get a M-F cable as well.
Click to expand...
Click to collapse
Im finding it near impossible to find a USB 2.0 Micro-A male to Micro-AB female cord. Especially in a shorter length.
I have up trying to find a cable and bought http://www.amazon.com/gp/product/B003NTYYXY. I will update my findings when I get it.
shaxs said:
Im finding it near impossible to find a USB 2.0 Micro-A male to Micro-AB female cord. Especially in a shorter length.
Click to expand...
Click to collapse
When I bought mine, I just Googled "buy micro usb extension." I just did it again and found this in seconds...
http://www.usbfirewire.com/Parts/rr-mcb-ext-xxg.html
A Micro B male fits both Micro A and B female, which is why nobody bothers selling Micro A male cables... It would be less compatible with nothing to gain.
RoboRay said:
When I bought mine, I just Googled "buy micro usb extension." I just did it again and found this in seconds...
http://www.usbfirewire.com/Parts/rr-mcb-ext-xxg.html
A Micro B male fits both Micro A and B female, which is why nobody bothers selling Micro A male cables... It would be less compatible with nothing to gain.
Click to expand...
Click to collapse
Thanks..I am surprised Monoprice doesnt carry it. Anywho, after shipping + cost of that cable + 2 x 2800 mAh, it was cheaper to buy the one from Amazon.
I am on travel very often and my last experience with my Desire was that when working on the phone with no possibility of charging it, I was left with very little or non battery late afternoon. Any suggestion for a good Travel Battery Pack anyone? One extra charge will do. Thanks
Probably better off getting a spare battery, and charge it up, most easiest way i think instead of carrying aa batteries and charge cases, leads etc.
Just look on ebay and click cheapest first.
Sent from my LG-P990 using XDA App
Kickasskev said:
Probably better off getting a spare battery, and charge it up, most easiest way i think instead of carrying aa batteries and charge cases, leads etc.
Just look on ebay and click cheapest first.
Sent from my LG-P990 using XDA App
Click to expand...
Click to collapse
Perhaps you are right. Thank you
you can get 3 spare batteries and a charger from ebay for about £10.50, Not sure whar that converts to.
stevvie said:
you can get 3 spare batteries and a charger from ebay for about £10.50, Not sure whar that converts to.
Click to expand...
Click to collapse
Cheap lol but check the postage time if they are from CHINA
Good Luck
Got these Conversions for you for a rough guide
Sunday, May 1, 2011
11 British Pound = 15.91271 Swiss Franc
11 Swiss Franc (CHF) = 7.60398 British Pound (GBP)
Median price = 1.44461 / 1.44661 (bid/ask)
Minimum price = 1.44461 / 1.44661
Maximum price = 1.44461 / 1.44661
Hope this helps
i use solar charger it has built in 3000Ma battery you can also charge it from pc or adapter and ready to go with extra power. Have it from ebay for $29
Did anyone test any spare batteries from ebay? Thought of getting some, but not sure if it is worth it or not (the charge should at least be as high as the stock battery's) .
Got this few days ago from a china online retailer. Good construction and nice pocketable size. Slightly heavier than LG2X & about 20% thicker. Comes with 0.5A & 1A USB output.
So far, on 0.5A output, no in-charger lock ups yet - which I do get from some AC chargers.
Priced upwards of US$35. Google for "5000mah Power Bank".
will LG come out with an extended battery for the Optimus 2X ?
If they made 2 models. one like we have with a 1500 battery and one that is 1.2-1.4X thicker with lets say a 3000 battery I think almost everybody would choose the slightly thicker 3000 battery model.
These devices are small enough as it is, they should now stop trying to make them smaller as they are surely limited by the screen size, and make them last longer.
I had a Del Axim X50v a few years back that I brought an extended battery and battery cover for, this actually made the device feel better in the hand.
I think the future is not far... for batteries that are either running on gas or like these ones which can be fully charged in less than 3 min. http://green.autoblog.com/2011/03/23/new-battery-technology-electric-vehicles-recharge-minutes/
stevvie said:
you can get 3 spare batteries and a charger from ebay for about £10.50, Not sure whar that converts to.
Click to expand...
Click to collapse
Well I order mine, but the version with 1 charger and 2 spare batteries (3 batteries is just plain greedy) We'll see how long they take to get here.
would like an option for dock/ battery charger and 2 batteries from ebay but combo NA last time i checked
Does anyone know of a portable battery pack that charges at over 500mah? all of the battery packs Ive seen are around 500mah and that doesn't seem to be enough to even charge the G2X coming from my old charger.
Spoo76 said:
Does anyone know of a portable battery pack that charges at over 500mah? all of the battery packs Ive seen are around 500mah and that doesn't seem to be enough to even charge the G2X coming from my old charger.
Click to expand...
Click to collapse
I am using a 5000mah capacity battery pack. It has a USB port with 500mA output and another USB port with 1000mA output. See post no. 8 on this thread.
http://forum.xda-developers.com/showpost.php?p=13703777&postcount=8
How many times do you charge 0->100% ur lg using this powerbank ?
How long it takes? You use the 1A output ?
felixthecat said:
would like an option for dock/ battery charger and 2 batteries from ebay but combo NA last time i checked
Click to expand...
Click to collapse
http://www.alibaba.com/product-gs/446992318/LG_P990_Optimus_2x_USB_Cradle.html
but you need to buy 50, and i have no idea how trustworthy is the seller.
tamere22 said:
How many times do you charge 0->100% ur lg using this powerbank ?
How long it takes? You use the 1A output ?
Click to expand...
Click to collapse
Only tested twice from over 70% to full on 0.5A. Took longer than using AC adapter. Tried it once on 1A but got a bit hot quite quickly, so I switched over to 0.5A. Also, it takes a while to charge the pack itself from partial empty to full on 1A AC adapter - so I am guessing the 5000mah claim is reasonably accurate.
I bought this item from DealExtreme.
2200mAh Rechargeable Portable Emergency Power with Phone Adapters
SKU: 23734
It works fine, but the input broke after some uses and I had to fix it.
Energizer works best for me... as LG P990 wouldn't last a day with WiFi and 3G active... i have XP2000 and it works great!, the free tip for life is a welcome bonus... I'd post the link but since am a newbie, i cant.
please google Energizer Energi to go or energizer XP2000
Who has one
Dont really need one imo but ill be checking out the zero lemon 9300 mah battery once its available sometime in april for $40.
http://forum.xda-developers.com/showthread.php?t=2175695
Sent from my SPH-L900 using xda premium
I picked up a 7960mah battery today it was only 50 % so I won't know how long it lasts until tomorrow will give it a full charge overnight it is big but the back case is better looking then the one I had on the original note, I actually did pretty good today for $60 I got this extended battery an otter box commuter case a samsung flip case and a samsung desktop dock not bad
golfinggino said:
I picked up a 7960mah battery today it was only 50 % so I won't know how long it lasts until tomorrow will give it a full charge overnight it is big but the back case is better looking then the one I had on the original note, I actually did pretty good today for $60 I got this extended battery an otter box commuter case a samsung flip case and a samsung desktop dock not bad
Click to expand...
Click to collapse
What?!? Links, please!!!
These were all off kijiji there are no links tomorrow I am getting a back case modified for wireless charging and the charging dock so enough accessories for this weekend
golfinggino said:
These were all off kijiji there are no links tomorrow I am getting a back case modified for wireless charging and the charging dock so enough accessories for this weekend
Click to expand...
Click to collapse
what's is kijiji? sorry, if its something you don't want to mention in the forum, you can PM me. I'm curious about that 8000 mAh battery. What size, double in height of original one? What brand? Can you confirm it's true capacity by peeling the label off? Pictures? Physically it can't be more than 6400 mAh if its double of OEM height, or more than 3200 mAh if its original OEM size. Really curious about the battery.
it is probably just a chinese copy - just google it - i did a quick search and found someone who got 11 hours screen on time with one of the same size so i thought i would give it a shot, paid $20 for it - might not even be worth that but who knows always can use it as an emergency back up battery - but i will do a test tomorrow from 100% and report back the screen on time
There seem to be a dozen or so out there. I would love to see reviews of any of the batteries listed below. I know from the work I did in this thread....
http://forum.xda-developers.com/showthread.php?t=1753726
...that Chinese batteries are very hit or miss, and there is often absolutely no correlation between the claimed capacity, and the true capacity.
The blunt reality, is that an extended capacity battery could have less capacity than the OEM cell. There were lots of cells tested in the thread above, that had under half the capacity of an OEM. It would be a shame to bulk up our phones with a double-thick battery, only to have less capacity than the OEM cell. So, any reviews out there?
(I'm not against doing another true-capacity battery shootout, this time for extended capacity Note II packs)
http://www.amazon.com/Anker-Extende...86811&sr=1-6&keywords=note+2+extended+battery
http://www.amazon.com/warranty-Exte...86811&sr=1-2&keywords=note+2+extended+battery
http://www.amazon.com/Hyperion-Exte...86811&sr=1-1&keywords=note+2+extended+battery
http://www.ebay.com/itm/EZOPower-Ex...166595?pt=PDA_Accessories&hash=item416ec34a83
http://www.ebay.com/itm/7500mAh-Ext...352576?pt=PDA_Accessories&hash=item43b6c7be80
http://www.ebay.com/itm/NEW-6500mAh...540684?pt=PDA_Accessories&hash=item4abe8dc00c
http://www.ebay.com/itm/7600mAh-Ext...016840?pt=PDA_Accessories&hash=item51a4f73ac8
http://www.ebay.com/itm/New-6500mah...541010?pt=PDA_Accessories&hash=item27d0b97a92
you are right it might be even less the the oem battery, i will run it from 100% tomorrow and post my results and some pics of the battery if anyone is interested, btw i am currently running the latest liquid smooth rom and soapkernel with pegasusq governor up to 1.92 ghz, i normally get around 5 to 6 hours screen on time under normal use, sleep is set to 1 minute, nfc is off, location services is on even though i dont really use it, brightness is on auto to the lowest setting - which is fine for me most of the time, i would say if it doesnt get 9 hours screen on time then it is not really worth it other then a spare back up battery for emergencys as it is quite bulky
rhd-android said:
There seem to be a dozen or so out there. I would love to see reviews of any of the batteries listed below. I know from the work I did in this thread....
http://forum.xda-developers.com/showthread.php?t=1753726
...that Chinese batteries are very hit or miss, and there is often absolutely no correlation between the claimed capacity, and the true capacity.
The blunt reality, is that an extended capacity battery could have less capacity than the OEM cell. There were lots of cells tested in the thread above, that had under half the capacity of an OEM. It would be a shame to bulk up our phones with a double-thick battery, only to have less capacity than the OEM cell. So, any reviews out there?
(I'm not against doing another true-capacity battery shootout, this time for extended capacity Note II packs)
Click to expand...
Click to collapse
My hat goes off to you!!!! Being a technical/detailed person myself, I absolutely enjoyed that write-up you have done for HTC Sensation. If you can do something like this for Note 2, that would be AWESOME!!!! As a matter of fact, I will let you borrow my Innocell (Seidio) 4500 mAh battery and another 4200 mAh "Gold" which I supposed to get in a few weeks. I don't have any hardware setup to make exact measurements, was just doing relative comparison when I was testing Innocell (check out link in my signature to all my accessory reviews).
Btw, do you mind posting a short write up with a few pictures of your setup to measure batteries? Maybe link to where I can get the equipment as well? I would really appreciate that!
vectron said:
My hat goes off to you!!!! Being a technical/detailed person myself, I absolutely enjoyed that write-up you have done for HTC Sensation. If you can do something like this for Note 2, that would be AWESOME!!!! As a matter of fact, I will let you borrow my Innocell (Seidio) 4500 mAh battery and another 4200 mAh "Gold" which I supposed to get in a few weeks. I don't have any hardware setup to make exact measurements, was just doing relative comparison when I was testing Innocell (check out link in my signature to all my accessory reviews).
Btw, do you mind posting a short write up with a few pictures of your setup to measure batteries? Maybe link to where I can get the equipment as well? I would really appreciate that!
Click to expand...
Click to collapse
That's a very kind offer!
I'm in Canada though, and one of the realities is that shipping to and from (mostly from) Canada, gets pretty pricey. I thought about doing this with batteries before (so that people could send me their cells for testing), but when I did the math, I realized that for less than the price of two-way shipping, I could just buy a new cell. It's unbelievable, but I can buy a cell from China, shipped to Canada, for a total price (including shipping) that is less than just the postage would cost me to re-mail the same cell to my next-door neighbor.
Maybe for the time being, we could at least collect a few recommendations. I've got a couple cells en-route already. I don't have a ton of cash to outlay on cells for a massive battery shoot-out, but I could certainly buy a couple. Any recommendations?
My setup -
{
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"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
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"lightbox_full_screen": "Full screen",
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I use a VA Meter that came from a Chinese gadget site. Out of the box, it is wired to pull its own power from the battery you're testing. The unit can be modified (and I have done so) to take an external 5V supply instead, the benefit being that once the cell dies, the measurement unit itself doesn't loose power. I've run discharges of several cells through this meter, and into a proper hobby charger (set to discharge) in order to verify that the inexpensive VA Meter (it was under $15) is actually accurate. It is. The measurements were within 1% of the proper hobby charger. The reason I don't use the proper hobby charger for measuring smartphone batteries, is that smartphone batteries discharge down to 2.5V before their protection kicks in. Hobby chargers (or at least mine) dislike that practice, and end the discharge cycle at 3V. The setup above, allows me to test all the way down to 2.5V before the battery's protection kicks in.
The funky looking thing with a fan is the test load. It's very much "overkill" for this type of testing, but I use the same setup to test up to 16V @ 2A packs, and that creates heat that needs to be dissipated actively. The circuit you see on the test load is a boost/buck circuit that does nothing other than supply the constant 12V to the fan, regardless of what voltage input it receives. Inside the test load, there are two 50W axial mount resistors, of different resistances, that I can selectively choose to discharge into, depending on what I'm testing.
Finally, those little clip leads are essential for connecting to the actual cells. For the Sensation testing, I actually made a little proprietary clip from a piece of PCB and solder blobs, that I would rubber-band onto the cells. These clips work much much better.
so i have tested the 7960mah battery that i picked up yesterday - i would say it is at least double of the oem battery, i have been using the phone alot today - downloading roms and torrents, xda, etc. so the screen has been on most of the day - you could run the whole day with the screen on the entire time if you really wanted to do and still make it through the day without having to charge it, i am just about to plug the phone into my computer as i need to get some files of it and also want to test out the wireless charging unit that i picked up today and flash a new rom - but here are the stats from today
the phone has been running on battery for 10 hours
screen on time 8 hours
battery remaining is 41%
i would not use this on a regular basis as it is a lot bigger but if you really needed the extra time then it will certainly deliver - the only time i would ever need this much battery is on the weekends when i am downloading alot, etc, so the screen is on almost the entire time
hope this helps anyone that is thinking of getting one decide
Since I'm waiting for 4200 mAh battery, presumably advertised as "oem replacement", I searched a couple more on-line places that sell the same "Gold" battery. Actually found 2 other on-line HK retailers that sell it with an actual disclaimer that its "4200 mAh battery, but you will not get more than 3100 mAh out of it" lol!!! What is funny, even with that disclaimer, they sell 3100 mAh replacement for about $4 while 4200 mAh replacement is $8 and a disclaimer of the same performance as 3100....
@golfinggino: is there a way to peel the label off your 7960 mAh battery? I have a feeling its probably a double capacity "stacked" 6200 mAh battery. Still great to have extra capacity when you need it, although with these double capacity batteries you don't get a good case. Per my review of Seidio's Innocell (link in the signature), they actually came up with a special version of ACTIVE case for their battery, but it's only 4500 mAh rated (although I found it to be of a higher capacity) and I don't understand why wouldn't they make it as a true double capacity.
Also, a general question to everybody, why wouldn't anybody talk about external battery banks?!? Wouldn't that be so much more easier to have a small charged up pack to hook up your phone too for a quick recharge? There are some that deliver true 2A output with capacities of 6 Ah up to 13 Ah and more. Anker, Exogear, and Yoobao make some quality slim external battery banks.
i am pretty sure it is probably just a double stacked batttery as i had one on my original note and that is what it had - i will see if i can peel off the label and check without ruining it - problem is i sell most of the android devices i have within a week or 2 and buy something new so i dont want to rip it all up ! this extended battery lasts alot longer then the extended battery i had in the original note that is for sure
rhd-android said:
...I'm in Canada though, and one of the realities is that shipping to and from (mostly from) Canada
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Understood, makes no sense to ship back'n'forth.
rhd-android said:
I use a VA Meter that came from a Chinese gadget site.
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I'm not too familiar with battery operation, but can find my way around electronics
So in theory you have a close loop (without taking into account ext power of VA meter and heatsink fan), with Battery, VA meter, and Rload in series? What is a value of Rload required for this measurement?
And then, you watch VA meter and time it until the voltage reading drops to 2.5V? What is the actual formula to calculate A/h? Do you need to monitor both Voltage and Current through VA meter? I have a regular multi-meter, but obviously can't monitor both at the same time without turning knob dial, and its battery operated so it will time out after awhile. Can a use multi-meter which plugs into a power outlet or do I need the actual dual display VA meter? I guess if you can show me the formula used to calculate mAh rate, I can figure out what I need for this setup.
I have one on my samsung galaxy s2 (t989)
Qcell 3650.
I couldn't live without it. Lasts a full day with heacy use + 4g + auto/low brightness. The stock battery barely made it to noon. I don't know how others can stand it.
I bought two Qcells, one for me and one for the gf. Both have performed well and can be found on amazon for $20 or so with a free cover.
Boy that sounds like a plug, but its not. I at one point was hunting for a good extended battery and found reviews online, so hopefully I am returning the favor for someone else down the road.
Sent from my SGH-T989 using xda app-developers app
vectron said:
Understood, makes no sense to ship back'n'forth.
So in theory you have a close loop (without taking into account ext power of VA meter and heatsink fan), with Battery, VA meter, and Rload in series? What is a value of Rload required for this measurement?
And then, you watch VA meter and time it until the voltage reading drops to 2.5V? What is the actual formula to calculate A/h? Do you need to monitor both Voltage and Current through VA meter? I have a regular multi-meter, but obviously can't monitor both at the same time without turning knob dial, and its battery operated so it will time out after awhile. Can a use multi-meter which plugs into a power outlet or do I need the actual dual display VA meter? I guess if you can show me the formula used to calculate mAh rate, I can figure out what I need for this setup.
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Luckily, it's a lot easier than that!
The VA meter, is actually a "VAmAH" meter I don't know why they just call it a VA meter, because it has an actual function built right in for tracking mAH, no math required. The meter knows the voltage that is being dropped across its output, and the current that is flowing through it so it just tracks the mAH as that all happens.
The fan gets it's power from the circuit's output, just like the resistor does. So it doesn't really matter if the fans running or not. If it is, then the load draws an extra 10mA or so of current, which gets tracked just like all the other current going through the resistor. In practice though, I generally don't bother connecting the fact for small cells like these. The resistor is only burning 3 or 4 watts, and that's fine for air to dissipate.
Someone earlier had a question about battery banks / external packs, and why people don't use them. I do, I have a whole bunch. But they're awkward in that you have to carry cables, and connect cables to your phone. I would echo an earlier poster who commented on the shame of connecting a mobile device to wires. The only time I ever connect my smartphone to cable is (generally) on it's first day in my possession, when I have to get it working with custom ROMs. After that, I generally never hook my phone to a cable again - can't stand the awkwardness of wires.
rhd-android said:
Luckily, it's a lot easier than that!
The VA meter, is actually a "VAmAH" meter I don't know why they just call it a VA meter, because it has an actual function built right in for tracking mAH, no math required. The meter knows the voltage that is being dropped across its output, and the current that is flowing through it so it just tracks the mAH as that all happens.
The fan gets it's power from the circuit's output, just like the resistor does. So it doesn't really matter if the fans running or not. If it is, then the load draws an extra 10mA or so of current, which gets tracked just like all the other current going through the resistor. In practice though, I generally don't bother connecting the fact for small cells like these. The resistor is only burning 3 or 4 watts, and that's fine for air to dissipate.
Someone earlier had a question about battery banks / external packs, and why people don't use them. I do, I have a whole bunch. But they're awkward in that you have to carry cables, and connect cables to your phone. I would echo an earlier poster who commented on the shame of connecting a mobile device to wires. The only time I ever connect my smartphone to cable is (generally) on it's first day in my possession, when I have to get it working with custom ROMs. After that, I generally never hook my phone to a cable again - can't stand the awkwardness of wires.
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I see. So what is a value of the load resistor, a few ohms probably? Do you by any chance still have a link to that VA meter you got?
With external batteries, I think either Anker Astro 2 (1A/2A, 8400 mAh) or Exogear ExoVolt (2A, 5200 mAh, stackable!!!!!! or Yoobao (1A/1.5A, 13000 mAh) would be my top choices. I would probably think that Anker Astro 2 for $38 is the best solution in this case of price/capacity.
Oh, and I guess you a wireless charging setup then? If so, wouldn't that be only in one place, like home? While you are on a road, at work, in a car - don't you need to use micro-usb cable?
vectron said:
I see. So what is a value of the load resistor, a few ohms probably? Do you by any chance still have a link to that VA meter you got?
With external batteries, I think either Anker Astro 2 (1A/2A, 8400 mAh) or Exogear ExoVolt (2A, 5200 mAh, stackable!!!!!! or Yoobao (1A/1.5A, 13000 mAh) would be my top choices. I would probably think that Anker Astro 2 for $38 is the best solution in this case of price/capacity.
Oh, and I guess you a wireless charging setup then? If so, wouldn't that be only in one place, like home? While you are on a road, at work, in a car - don't you need to use micro-usb cable?
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I think I have a 10 ohm and a 5 ohm in there, that I can select between, or parallel or series. In practice I try to deplete smartphone cells at as close to 1A as possible when at full voltage (obviously because of ohms law, the rate drops a bit as the voltage falls).
I got 3 batteries 2 extended and one fake double cell from chinaI got off ebay.
One 7600mAh and anker extended 6200mAh.both from amazon
I ran nova battery tester in short for battery quick test.for the last 3 test.
the first test are uirrelevant due to the fact that that I had no bios for my phone model in nova at the time. That fourth one upis right when I got the anker and found the bios for my phone.then I ran the short test on the
Anker, 76, china at the end. Also I aged my extended 76 and it puts out 10hours continous on screen time.
My 76 I charge in the low run 350 +/-50mA china solo battery charger. 18 hours out put and at lleast about a days use or more . I charge one extended while im using the other but still I want more power I was wonder if any has made their own extended battery mod. Im thinking about adding the two extended battery on the back and putting them in series the make a suposive brickscreen device. With power for a week. Im looking fir easy make series some how .. but I digest.
Heres nova.
For those that want to be sure they can make long trips without running down their battery, try this battery pack. Packs with only about 10% of this capacity sell at this price. 30000mah for less than $25. Notice that that is 30000 and not just 3000.
I won't guarantee their stated capacity, but I'm still trying to run down the one I got last week. Once I succeed in getting it discharged to the point where the internal N7 battery takes over, I'll post the result.
It's from China, I doubt very much that the actual rating is even close to the 30000mAh stated.
Also I see from the label that they say 5v input and 5v out?? it's not possible to fully charge a 5v battery with a 5v charger, the input voltage needs to be higher.
Looking at the sellers negative/neutral feedback most of the complaints seem to be about cheap and shoddy items which doesn't bode well for what you'd get.
Troute said:
It's from China, I doubt very much that the actual rating is even close to the 30000mAh stated.
Also I see from the label that they say 5v input and 5v out?? it's not possible to fully charge a 5v battery with a 5v charger, the input voltage needs to be higher.
Looking at the sellers negative/neutral feedback most of the complaints seem to be about cheap and shoddy items which doesn't bode well for what you'd get.
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Ipads are made in China. So what? 5v in and out is done all the time via internal switching PS. If you buy one and test it, then your opinion of "shoddy items" might count. As it is, I am testing it and so far the results are quite impressive.
To give you some real world data to work with, I have a 10,000mAh battery pack which will charge the N7 from about 30% to full twice with a bit left over, it's an Anker Astro 3 and quite big which it needs to be to pack in 10 Amps. Once you've had a chance to test yours maybe you can post the results here.
Troute said:
To give you some real world data to work with, I have a 10,000mAh battery pack which will charge the N7 from about 30% to full twice with a bit left over, it's an Anker Astro 3 and quite big which it needs to be to pack in 10 Amps. Once you've had a chance to test yours maybe you can post the results here.
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That sounds about right for a 10A pack. I'm still testing mine but I only use it when I'm out. So far, active reading time only amounts to about 4 hours. The tablet has been on for several days but most of the time in sleep mode. So far the battery pack still only has the first of the four LEDs blinking. I'll be using it for several hours today and I'll see what that shows.
As I said, I use it primarily for reading when I'm out but during that time wifi, MagicJack and Groov IP are all running and I do some browsing.
edit: Update. So far the N7 has been on for about a week with about 16hrs of actual use. The battery pack LEDs indicate it still has half charge. I'm quite happy with it.
Hi,that seems to be a cool pack,any new feedback?