I have the ambition to build a home made external battery pack for my HD2 . I'm not a electrical engineer, my knowledge on this is very basic. But, if I start to think, wouldn't it be just as easy as mounting 3 or 4 AA batteries in series, because USB is 5V? But then is the is the amperage enough?
Please give me some thoughts!
http://www.boxwave.com/products/batteryadapter/batteryadapterforminisync.htm
http://www.boxwave.com/products/batteryadapter/index.htm
I have the first one, but modded it so that the USB port is directly attached to the case (like the second one).
Haven't failed me yet; however it won't charge an iPod due to its unique USB circuitry
Yup, 4 AA rechargeable batteries would do it, I wouldn't try alkaline ones as that would give a good 6V.
Alright thanks after all. I think I'm not going to make it myself, because taking the risk of blowing my HD2 is one step too far now .
the biggest problem with external packs vs AC adaptor is that
1) most AA battery packs outputs to HD2 @ around 100ma reason being the voltage is too low.
2) i have tried that sanyo 5000ma USB battery pack which does around 400ma, it charges faster but it's actual power output is around 4v
the key is the higher the voltage, the faster it charges.
I have seen most 4AA battery packs are conected as 2x serial, 2x parrallel, which means if you are using 2500mah batteries, it's only [email protected]
http://www.boxwave.com/products/batteryadapter/batteryadapterforminisync.htm
this device is connected as such as i have it also.
I tried using sanyo eneloops, hd2 recharges @ 140ma
i tried 2800mah powerex, HD2 charges @ 110ma
i tried diposalble lithium, hd2 charges @ 350ma (measured at 3.3v )
4AA all connected in serial would be the most ideal. but it only stores very little power. 1.3v x4=5.2v but if your battery is 2500mah, then it's only [email protected]
the higher the voltage the faster it charges.
I am actually thinking of building a 8AA battery, to make it a [email protected] but 8AA batts aint light. but am sure it will charge the phone as fast as AC adaptor.
AC adaptor does around 5v -/+ 0.3v 850ma
I am thinking out making my own battery pack also. one that does 5.2v @ 2000ma so that it can charge the battery as fast as AC adaptor.
but the problem is li-ion chemistry dont really allow high discharge unless it's A123 batteries.
2nd is that nimh batts are capable of high discharge but they dont really store alot of power in terms of weight to power ratio.
nimh states 1.2v but is 1.3v at full charged. highest i have seen from my batts are 1.35v
li-ion states it's 3.7v but at full charge it's 4.1v, highest i have seen from my batts are 4.25v
the key is building a circuitry that ups the voltage to 5v and acts as a voltage stabilizer aka mosfet and capacitor. but P=IV and considering the power loss from voltage conversion.
sigh.... why cant anyone build a extended battery the size of iphone's external battery slot-in. i dont mind if the phone is thicker. but rather than a hump in the middle of the phone, they can always make the battery the size of the phone. kind of like battery+case type.
the thing about battery ratings are,
eg, rechargeable batteries states 1.2v, that is actually the MINIMAL voltage.
same goes for akaline. 1.5v @ minimal.
li-ion 3.7v MINIMAL.
lithium 1.6V minimal , i have one batt at measures as high as 1.77v !
all devices have a wide range input. for reasons
1) AC adaptor rates @ 5v but it need tolerance cuz it fluctrates from 4.6-5.4v
2) batteries start high, ends low, but voltage curve is very stable.
There are more than enough commercial, regulated packs either for AA batteries or with integrated li-ion batteries, for many budgets, to lose time making one yourself IMO.
Thanks for your story .
Please keep me posted if you are going to try for yourself!
purezerg said:
the biggest problem with external packs vs AC adaptor is that
1) most AA battery packs outputs to HD2 @ around 100ma reason being the voltage is too low.
2) i have tried that sanyo 5000ma USB battery pack which does around 400ma, it charges faster but it's actual power output is around 4v
the key is the higher the voltage, the faster it charges.
I have seen most 4AA battery packs are conected as 2x serial, 2x parrallel, which means if you are using 2500mah batteries, it's only [email protected]
http://www.boxwave.com/products/batteryadapter/batteryadapterforminisync.htm
this device is connected as such as i have it also.
I tried using sanyo eneloops, hd2 recharges @ 140ma
i tried 2800mah powerex, HD2 charges @ 110ma
i tried diposalble lithium, hd2 charges @ 350ma (measured at 3.3v )
4AA all connected in serial would be the most ideal. but it only stores very little power. 1.3v x4=5.2v but if your battery is 2500mah, then it's only [email protected]
the higher the voltage the faster it charges.
I am actually thinking of building a 8AA battery, to make it a [email protected] but 8AA batts aint light. but am sure it will charge the phone as fast as AC adaptor.
AC adaptor does around 5v -/+ 0.3v 850ma
I am thinking out making my own battery pack also. one that does 5.2v @ 2000ma so that it can charge the battery as fast as AC adaptor.
but the problem is li-ion chemistry dont really allow high discharge unless it's A123 batteries.
2nd is that nimh batts are capable of high discharge but they dont really store alot of power in terms of weight to power ratio.
nimh states 1.2v but is 1.3v at full charged. highest i have seen from my batts are 1.35v
li-ion states it's 3.7v but at full charge it's 4.1v, highest i have seen from my batts are 4.25v
the key is building a circuitry that ups the voltage to 5v and acts as a voltage stabilizer aka mosfet and capacitor. but P=IV and considering the power loss from voltage conversion.
sigh.... why cant anyone build a extended battery the size of iphone's external battery slot-in. i dont mind if the phone is thicker. but rather than a hump in the middle of the phone, they can always make the battery the size of the phone. kind of like battery+case type.
the thing about battery ratings are,
eg, rechargeable batteries states 1.2v, that is actually the MINIMAL voltage.
same goes for akaline. 1.5v @ minimal.
li-ion 3.7v MINIMAL.
lithium 1.6V minimal , i have one batt at measures as high as 1.77v !
all devices have a wide range input. for reasons
1) AC adaptor rates @ 5v but it need tolerance cuz it fluctrates from 4.6-5.4v
2) batteries start high, ends low, but voltage curve is very stable.
Click to expand...
Click to collapse
It's not only a matter of saving time, it's just nice to make your own. It gives pleasure . And some excitement for the risk of blowing an expensive phone .
kilrah said:
There are more than enough commercial, regulated packs either for AA batteries or with integrated li-ion batteries, for many budgets, to lose time making one yourself IMO.
Click to expand...
Click to collapse
GeitjeG said:
It's not only a matter of saving time, it's just nice to make your own. It gives pleasure . And some excitement for the risk of blowing an expensive phone .
Click to expand...
Click to collapse
If youre into making it yourself,
there's this site:
http://www.ladyada.net/make/mintyboost/
there are detailed instructions and design schematics
+ the parts list.
It would be more complex than using a simple 4 AA battery case connected to a usb plug, but considering that without a voltage regulator wou would be limited to rechargable batteries (since 4 regular AAs would give too high voltage), and considering saving the weight and size of 2 more AAs . . .
Anyway -
give it a look.
(PS - I found this site some time ago, I do not own it, and do not have any connection to it)
Som30ne said:
If youre into making it yourself,
there's this site:
http://www.ladyada.net/make/mintyboost/
there are detailed instructions and design schematics
+ the parts list.
It would be more complex than using a simple 4 AA battery case connected to a usb plug, but considering that without a voltage regulator wou would be limited to rechargable batteries (since 4 regular AAs would give too high voltage), and considering saving the weight and size of 2 more AAs . . .
Anyway -
give it a look.
(PS - I found this site some time ago, I do not own it, and do not have any connection to it)
Click to expand...
Click to collapse
I'm using 4NiMh rechargeables giving 2800mAh in a clear AA case with USB soldered onto the case terminals with a flying lead and its fine.
"Turns out some devices don't like being charged with a battery pack, usually devices that require special drivers to charge. "
I just cross checked with my electrical enginner friend
he said that different devices hvae different tolerance.
eg, some devices only accept 4.95-5.05v
there is a circuit in all USB devices to stablise the voltage. to suppress/reduce if it's too high, but nothing if it's too low.
purezerg said:
"Turns out some devices don't like being charged with a battery pack, usually devices that require special drivers to charge. "
I just cross checked with my electrical enginner friend
he said that different devices hvae different tolerance.
eg, some devices only accept 4.95-5.05v
there is a circuit in all USB devices to stablise the voltage. to suppress/reduce if it's too high, but nothing if it's too low.
Click to expand...
Click to collapse
I heard no such thing.
I did see a courious behaviour in some devices,
that needed some voltage on one of the data pins as well in order to start charging.
Connecting these devices to a power supply that fed the power wires only, and didnt put anything on any of the data wires did not charge the devices.
hi mates
why dont you just use 10 recharg.batteries and the circuitry of the original HTC HD2 car charger ? it works like butter&honey for me : )
Right guys, thanks for the input.
After I think it's not worth the risk to build a pack completely myself.
The 3 best options that sound easy and safe to me are:
- Using the car charger circuitry with 10 eek rechargable battteries.
- Buying a cheap one on internet
- Building one using a tried tutorial
GeitjeG said:
Right guys, thanks for the input.
After I think it's not worth the risk to build a pack completely myself.
The 3 best options that sound easy and safe to me are:
- Using the car charger circuitry with 10 eek rechargable battteries.
- Buying a cheap one on internet
- Building one using a tried tutorial
Click to expand...
Click to collapse
Choice #1 is obivously undesirable.
Choice #2: Internet ones usually don't have voltage and current protection. For example, the boxwave one I linked to is just a simple charge circuit with no built-in resistors and such.
Choice #3: I would suggest using Mintyboost: http://www.instructables.com/id/MintyBoost!---Small-battery-powered-USB-charger/
purezerg said:
...4AA all connected in serial would be the most ideal. but it only stores very little power. 1.3v x4=5.2v but if your battery is 2500mah, then it's only [email protected]
the higher the voltage the faster it charges. ....
Click to expand...
Click to collapse
AFAIK, the charging speed of the device is a function of current, not voltage. A source that outputs at a maximum of 500mA will charge a device twice as slow as a source that outputs at a maximum of 1A, if it is assumed that the device can take in charge at a current of 1A
This tutorial looks really nice and seems well thought out...!
...
felixdd said:
Choice #3: I would suggest using Mintyboost: http://www.instructables.com/id/MintyBoost!---Small-battery-powered-USB-charger/
Click to expand...
Click to collapse
...
http://www.energizerpowerpacks.com/us/products/xp1000/
it says this is ithium polymer battery cell. does it matter to charge this with our lithium ion battery legend????
not sure about energizer but i'm using Sanyo Eneloop,
eneloop.com.sg/products/products/mobile-booster/kbce1ssp.html
just for emergency when on the move and no way to charge the phone.
tried once charging the phone when it just left 4% battery charge. the eneloop able to charge the phone (the phone led and notification indicates charging), n charge the phone up to 20% before the eneloop drains. the one i have is 5VDC 500mA output.
Here's some higher capacity / less expensive alternatives to the energizer:
5000mah w/ dual USB:
http://mobile.brando.com/usb-power-station-ii-5-000mah-_p05376c0843d003.html
2500mah w/ single USB and dual solar panels:
http://mobile.brando.com/universal-solar-charger_p02152c0843d003.html
They have some nice docking stations w/ 2nd battery chargers too. Seems like there's quite a few good deals.
Found an even better one since my last post:
http://www.dealextreme.com/details.dx/sku.40210#open full view
rewen said:
Found an even better one since my last post:
http://www.dealextreme.com/details.dx/sku.40210#open full view
Click to expand...
Click to collapse
It doesn't say, but it would be nice if it's Lithium-Ion. Most solar batteries are NiMH and those aren't as good. Either way though, that's a great price.
Hi,
I found a portable charging device which has an output of 5v 2500mAh.
http://www.ebay.com/itm/5V-2-5A-Out...B-Battery-Charger-18650-Box-NEW-/260936968759
To my knowledge, most lithium batteries has no problem charging at 1C, but for what I can see, there is no original chargers from any manufacturers for any phone that charges at 1C.
So my question is, since the battery capacity for galaxy note is 2500mAh, is it safe to charge at 2500mAh rate too? Does it dramatically affect lifespan etc?
Thanks.
Hello,
the charger you are referring to has the output 5V and 2500Ah = 2,5A, not 25000mAh..
Is it safe to charge Note with this?
I guess it is.
Just because the charger can give you 2,5A current, doesn't mean that that kind of current will really flow to your device.
I suppose that each mobile phone (including schaisung note ) has its own charging control system, and will not damage the battery.
Regards
Hubert
given that the charger that comes with the Note (and most other phones AFAIK) are rated at 1amp, I personally wouldn't want to use something pushing a higher amperage than the phone was designed for.
wouldnt it be easier just to get a spare battery and swap instead?
@hub
I think you must have misread.. I did not say it is 25000mAh, but 2500mAh (and yes, I do mean 2.5amp output), I won't be so crazy to charge it 25amps unless I want to see some explosion
As for why I just don't want to just buy a spare battery, mainly because I feel uncomfortable having to open/close battery door frequently and im using a case so makes it more of a hassle to do so.
Anyway, the question remains, is it safe to charge the battery @ 2.5amp, 1C?
AFAIK 2.5A should be risky when the note is rated a 1A under the battery.. and 4 x 18650 would be HUGEE size. I would rather go with the 1A & 2 x 18650 which is safe and small.. you can always carry extra 18650 with you instead of loading all the 4.. my 2 cents..
http://www.ebay.com/itm/5V-1A-Outpu...ltDomain_0&hash=item4ab2eae7b0#ht_3985wt_1185
tablighs said:
Hi,
I found a portable charging device which has an output of 5v 2500mAh.
http://www.ebay.com/itm/5V-2-5A-Out...B-Battery-Charger-18650-Box-NEW-/260936968759
To my knowledge, most lithium batteries has no problem charging at 1C, but for what I can see, there is no original chargers from any manufacturers for any phone that charges at 1C.
So my question is, since the battery capacity for galaxy note is 2500mAh, is it safe to charge at 2500mAh rate too? Does it dramatically affect lifespan etc?
Thanks.
Click to expand...
Click to collapse
@tablighs
Of course, that was my typo.
What I meant that the current is given in A (or mA etc) not Ah...
Thanks everyone for your help!
Hi,
I have a modified universal battery charger than I have altered to take power source from my tablet adapter that has an output of 2amps. I use it to charge my spare tablet batteries.
Is it safe to charge o2x batteries with it since the original charger charges @1amp and the battery itself is 1500mAh. Is there a chip inside the battery protecting/regulating the voltage/current?
Thanks.
As far as i can tell the O2X has a management chip for charging. I can tell that because it goes through a cycle every time it charges (gets really slow and cold) above 90% charge. I think there shouldn't be a problem using a 2A charger.
So this management chip you are talking about, it is inside the battery right? Not inside the phone?
Yes, afaik it should be inside the phone. I guess you could check with a service manual but you'd need some electronics expertise.
Got this external USB battery at a sale price. This model from Choetech packs in a few surprises.
http://www.amazon.com/Bank-CHOE-15600mAh-Lightning-Charging-Supported/dp/B00ZCGLBT6/
$26 with code MIFLDQVJ
This is the only battery pack I’ve ever seen that can recharge over both microUSB and Lightning, meaning you should always have a charging cable handy. It also supports Quick Charge 2.0 input and output, meaning you can recharge the massive 15,600mAh cells up to 75% faster, and get that juice into your phone with minimal delay. $26 is a bit of a premium for a battery this size, but I’d say the features make it worth it.
Nice one
Michael Hill said:
Got this external USB battery at a sale price. This model from Choetech packs in a few surprises.
http://www.amazon.com/Bank-CHOE-15600mAh-Lightning-Charging-Supported/dp/B00ZCGLBT6/
$26 with code MIFLDQVJ
This is the only battery pack I’ve ever seen that can recharge over both microUSB and Lightning, meaning you should always have a charging cable handy. It also supports Quick Charge 2.0 input and output, meaning you can recharge the massive 15,600mAh cells up to 75% faster, and get that juice into your phone with minimal delay. $26 is a bit of a premium for a battery this size, but I’d say the features make it worth it.
Click to expand...
Click to collapse
Yup nice for this info. it's really good.
The direct charging technology that was till date used for charging the mobile and other gadgets have been slowly replaced by this indirect charging that offer utmost convenience at the time of traveling or commuting. It has two-way charging capacity that allows its battery to get charged from an external power source and later the same battery power is used to charge another device. no power bank utilizes its capacity to the fullest which means if you use 12000 mAh battery then it won’t charge 6 phones with 2000 mAh capacity as there is some amount of power loss during transfer that cannot be ignored.
high capacity one's take much time for charging So, go for optimum capacity that usually triple to phone battery capacity.
Power bank batteries are available in two variants Li-Polymer Battery & Li-Ion Battery. Familiar is Li-Ion battery because of lighter, sleeker, and portable to carry and better battery backup. Charging time depends on plugs, are 1A or 2A, Usually 2A charge quickly but it should support by the device.
For Indians you can get a power bank
at Rs 999 at http://www.latestone.com/power-banks