Database Develop

Best replacement battery (high capacity)?

Hi, looking through these batteries at fleaBay http://tinyurl.com/5n7hko who can recommend which would give me the best performance - preferably better than the original.
Currently with WiFi and Bluetooth on, I am lucky to get 3-4 hours of life out of the thing.

I can't comment on the batteries on the link you've posted because I'm no fan of Ebay electrical products, bu there are numerous other batteries which have been discussed on this forum too.
The mother list of Kaiser Tilt TyTN II batteries.
http://forum.xda-developers.com/showthread.php?t=349467
1600 mAh battery
http://forum.xda-developers.com/showthread.php?t=374968
Mugen Power 3000 mah extended battery & accessory compatibility: what works, what doe
http://forum.xda-developers.com/showthread.php?t=358348
Keomo charger, APC Mobile Power Pack (and other portable charger / battery)
http://forum.xda-developers.com/showthread.php?t=346324

Thanks, seems like Mugen is the best brand. I ordered a Mugen 1500 battery so as to not enlarge my back cover and all my docks can still work. £23 from http://shop.eten.hu

I got my self this extra battery booster:
http://www.batteribyen.dk/sanyo_mob....html?osCsid=709f85814938661bbb6d24dd990ea4d3
Neat little thing with about 5000 mah and it has two usb ports so that I can charge up to two devices.
With this I don't need to charge my phone/battery booster for 4 - 5 days.

external battery pack

I'd like something like this:
http://chinagrabber.com/2200mah-sli...dock-for-iphone-3g---isolar-battery-2200.aspx
for heavy days... do you think it's possible to have it for HD2?

Yes Please, and make it at least 2700, then it's up to standard. (Rechargeable batteries AA these days can reach 2700. So what you really want to make it count is 2x2700 mAH in a slim formfactor with the HD2's fit and a micro-usb connection. And while they're at it add smart technology so the phone runs on the external battery pack and not the phone's battery (like the mophie juicepack on the iPhone).
See also http://forum.xda-developers.com/showthread.php?t=575697

Have a look in this thread, last posting (as of now).
http://forum.xda-developers.com/showthread.php?t=586362
The externall HTC battery is incredible, really small and yet it charges the HD2 three times on one charge.

thank you! a picture speaks a thousand words

htc hd2 external battery pack
gtm55 said:
I'd like something like this:
http://chinagrabber.com/2200mah-sli...dock-for-iphone-3g---isolar-battery-2200.aspx
for heavy days... do you think it's possible to have it for HD2?
Click to expand...
Click to collapse
Me I went for this one >> ORA Lil Sync USB Mobile Power Pack
版本: 4400 mAh
Description
Looking for renewable power to recharge your device while on the road? Use our USB Mobile Power Pack (MPP) with our Lil’ Sync® Retractable Sync-N-Charge Cable to charge your device. Designed with the mobile user in mind, it utilizes Li-ION battery technology and fits in the palm of your hand. We've stuffed a full 4400 mA capacity into this small package. You can recharge the MPP via your computer's USB port or you can use our USB AC Adapter or USB Auto Adapter. The MPP has a three level LED indicator system that keeps you apprised of the level of charge remaining.
Specifications
•Input (Mini USB) : 5VDC, 500mA Min.
•Output (USB Type A Port) : 5VDC, 1000mA
•Battery Chemistry: Li-ION
•Battery Capacity: 4400mAh
•Net Weight: 4.3 oz
•Dimensions: 2.75" L x 2.10" W x .86" H
IMPORTANT: The Lil’ Sync® Retractable Sync-N-Charge Cable, or another sync and charge cable, is required to connect your device to this Power Pack. A standard USB A to Mini 5 cable is included with the Power Pack.
* Release Date: Monday 18th February 2008
* Shipping Weight: 0.26kg

I got one of these from Taiwan:
http://www.amazon.co.uk/Vosonic-Battery-Universal-portable-devices/dp/B001J32ZSW
The price at Amazon seems crazy though. It costed me about £70 and I get about 5 charges with it using Hero. I have not yet needed it for HD2 but I guess total charge cycles should be similar.
Full specs here:
http://www.google.co.uk/url?sa=t&so...yciNBA&usg=AFQjCNEhK7h0z0IWAzDTJOjC7fvzgCP5ow
It is not as big as it looks and gives a piece of mind when traveling.

Home made external battery pack

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
...

Zagg Sparq 2.0, extended battery replacement?

Hi guys,
I have bought this interesting gadget and wanted to draw your attention towards it and ask your opinons and views. This post might be helpful to particulary those who doesn't want to compromise the looks of their HD2 with the bulky extended battery "The Camel Hump".
Also I am attaching some pictures of my device. The one that I have is version 1. In version 2.0 one of the 2 USB outputs can give power upto 2000amp while in version 1 the USB outputs are only 1000amp each. So please guys post your views and help others making good choices, or on the other hand save them from pain or waste of money.
Although they advertise on their website only Iphone and Ipad, it does work with HD2 and any other device that can be charged with a USB.

Specifications and Features
The specifications and features are copied and pasted from Zagg website. This post is neither advertisement, nor i am earning any benefit of any sort.
ZAGGsparq 2.0 Specs:
6,000 mAh Lithium Polymer
Has the power to charge an iPhone four times
4 yellow lights indicate power level, 25%-50%-75%-100%
Has the ability to charge multiple USB devices simultaneously
Max output: 2000mA @ 5V
Power Source: 100-240 VAC @ 50/60 Hz
Physical Size 3.5 x 3.5 x 1 inches
Weight .54 lbs.
ZAGGsparq 2.0 Features:
Portable power: More than a simple extended battery, ZAGGsparq 2.0 carries multiple charges for any personal electronic device with you - including four full recharges for a power-hungry Apple iPhone™
On-the-go convenience: ZAGGsparq 2.0 fits easily in a pocket or bag, the perfect size for travelers and business people
Very compatible: ZAGGsparq 2.0 works with most USB charged device, including cell phones, handheld gaming systems, and digital cameras (adapters for mini-USB to USB sold separately)
Charge multiple devices: ZAGGsparq 2.0 provides twoUSB charging ports: Optimized and General
Optimized: The top USB charging port is optimized for smartphones and other devices that are capable of taking an optimized charge, including Apple's iPhone, iPad and iPod family of products.
General: The bottom port uses the standard USB specification and will charge devices that do not utilize the optimized USB charging specification.
Superior Engineering: ZAGGsparq 2.0 has been specifically engineered to charge Apple's iPad. It adds an additional 5 to 6 hours of video playback to the iPad.

does it work with htc desire? has anyone tried so far.

urh.. i've read about this before.
it took like 9 hours to charge itself and occasionally drain the connected phone battery completely :/ did they fix that? (version 1.0)
how many charges can you get out of that with the hd2 stock battery?

I just bought one of these (with a 50% off coupon ) and it works as advertised. I've only charged the phone once so far, so I can't comment on longevity yet.

alfredob1 said:
I just bought one of these (with a 50% off coupon ) and it works as advertised. I've only charged the phone once so far, so I can't comment on longevity yet.
Click to expand...
Click to collapse
which phone are u using sir.

ethereal123 said:
which phone are u using sir.
Click to expand...
Click to collapse
T-Mobile HD2.

I bought the official HTC version of this for my TP2 (and now using it for my HD2), and it works great! I just keep it in my bag and whip it out (along with a USB cable) when i'm out and about and the mobile battery is about to give out.
The Sparq 2.0 looks good, especialy as it 6,000mAH, which you should be able to get a few charges of the mobile out of. Does it work? Or do the problems Rhinzo mentioned still exist?

I bought this battery two weeks ago. It does work with the HD2. Based on the capacity of it one would assume it could last up to 4 charges but I find this is not the case, I get about 2 and a half full phone charges out of it. Note that:
- I left the phone plugged in overnight (so longer than a full charge would take)
- I haven' "trained" the battery yet to reach its full capacity
- Efficiency of charging one battery out of another is probably not 100% in any case.
Alternatives which I haven't tried are the powergorilla and minigorilla batteries. They are a whole lot more expensive though.

Review: 11200mah Yooboa Power Bank - any alternatives?

So I purchased this for my note off eBay. Paid about $40 shipped to my door. Impressed by the quality, it looks sturdy and would last a while.
I used battery current tester and only got 600max charge apposed to the 1200 my stock Samsung charger puts out.
This means 4-6 hours charge time instead of 2 and I must say when I use the phone on charge it actually sucks battery.
It's rated at 2amps which was my mistake but unsure if it makes much difference at 2.1amps.
" Input: DC5V---1000mA; Output 1: DC 5.3V?1000mA (Max); Output 2: DC 5.2V?2000mA (Max)
1A & 2A output at the same time, suit charge for mobile phone, Tablet PC, Digital Camera etc."
Does anyone know how I can get 1200? Or can suggest a power bank for the note 2 that can hold a good charge in say 2-3 hours?
Sent from my GT-N7105T using xda premium

I assume you are not on Verizon and using Galaxy Charger Current app to track your current?
OK, here is a scoop on external battery pack you got. Since you bought it from ebay, I can guarantee you that Yooboa is a fake HK version. eBay sellers buy it form Aliexpress retailers in bulk and re-sell it at double the profit. Take a look here: http://www.aliexpress.com/wholesale...00mah&catId=0&initiative_id=AS_20130429044248 - you can get it for $20 shipped free to US (but aliexpress retailers doesn't accept paypal).
There only a few authorized Yoobao resellers in the world, and Kevikev is probably one of the few (if not the only one) in US. Even at his discounted price, this real model cost $55: http://kevikev.com/Yoobao-Long-March-11200mah-Power-Bank-for-USB-Mobile-Device-YB-642.htm
The fake ones look very real but have fake guts. Beside 600mA current you measured (or maybe it's just a typical 500mA pc-usb current?), it most likely is not 11200 mAh but probably half of it, and you also have to take in consideration 30% de-rating on top of it since mAh capacity on external batteries is at 3.7V while it has to be converted to 5V usb output where you loose 25%-30% due to inefficiency.
I recommend Anker and NewTrent external power banks I have tested and reviewed (summary of my review links in my signature). Just keep in mind those mAh numbers in reality are always 30% lower for the actual capacity your phone sees. I also been informed NewTrent will be releasing 13000 mAh slim battery in a few weeks which I'm going to review as well. But either way, Anker and NewTrent are trusted brand names (with a ton of amazon positive reviews) and offer 1A and 2A outputs and also 1A input charging of the battery itself so you can quickly charger your battery pack and then quickly charger your phone as well.

I'm on an Australian Telstra phone.
Used the original cable for those figures which is embarrassing.
Looks like I'm tossing this junk, I'll just go buy one you mentioned.
Thanks heaps for your help
Sent from my GT-N7105T using xda premium

Brayden87 said:
I'm on an Australian Telstra phone.
Used the original cable for those figures which is embarrassing.
Looks like I'm tossing this junk, I'll just go buy one you mentioned.
Thanks heaps for your help
Sent from my GT-N7105T using xda premium
Click to expand...
Click to collapse
You are welcome. If you are not in a rush and can wait till mid of May, the NewTrent upcoming PowerPak+ might be a good choice since you are after a higher capacity. I only have their preliminary spec but its going to be 13,500 mAh (@3.7V) with 1A input charging, and dual 1A and 2A outputs, and dimensions of 125mm x 68mm x 28mm @ 283g.
Also, as I mentioned in other threads, stay away from those ebay no name 20,000 mAh ext battery bricks...

vectron said:
You are welcome. If you are not in a rush and can wait till mid of May, the NewTrent upcoming PowerPak+ might be a good choice since you are after a higher capacity. I only have their preliminary spec but its going to be 13,500 mAh (@3.7V) with 1A input charging, and dual 1A and 2A outputs, and dimensions of 125mm x 68mm x 28mm @ 283g.
Also, as I mentioned in other threads, stay away from those ebay no name 20,000 mAh ext battery bricks...
Click to expand...
Click to collapse
Believe it or not, i read your reviews and cross checked some prices online.
The NewTrent may be a better battery than the Anker, but its about 3 x the price to get them from US to AUS.
I ended up getting the new ANKER A4 13000mah
1. Because the 3E was the only other for sale
2. They're both USB input so it makes more sense just to go the higher mah rating
3. Its a new model
Paid $60 shipped to my door from ANKER off ebay.
I purchased it for travelling across Europe - i want the option to charge via AC + USB instead of just AC with the Anker 3. I only intend to use it with my Note anyway and bought it because Hostels won't always have free powerpoints.
My last question i was worried about and just bit the bullet with is: How long does it take to charge via AC (samsung stock) ? It says a crazy 8-10hours on the website via USB. I don't want to leave it alone fearing someone will steal it if its 10 hours.
Thanks again - how do i thank you in your other post? can't find the button.

Brayden87 said:
Believe it or not, i read your reviews and cross checked some prices online.
The NewTrent may be a better battery than the Anker, but its about 3 x the price to get them from US to AUS.
I ended up getting the new ANKER A4 13000mah
1. Because the 3E was the only other for sale
2. They're both USB input so it makes more sense just to go the higher mah rating
3. Its a new model
Paid $60 shipped to my door from ANKER off ebay.
I purchased it for travelling across Europe - i want the option to charge via AC + USB instead of just AC with the Anker 3. I only intend to use it with my Note anyway and bought it because Hostels won't always have free powerpoints.
My last question i was worried about and just bit the bullet with is: How long does it take to charge via AC (samsung stock) ? It says a crazy 8-10hours on the website via USB. I don't want to leave it alone fearing someone will steal it if its 10 hours.
Thanks again - how do i thank you in your other post? can't find the button.
Click to expand...
Click to collapse
Uh, totally forgot m8, you are Down Under I know it has been mentioned before by others that shipping outside of US for some products could kill the price. Or sometimes you can't even get the product shipped out; there is a thread started by another member from Australia about getting Zerolemon 9300 mAh battery.
I was about ready to suggest another battery from Yoobao (genuine) rated at 15,600 mAh for $60 from Kevikev, but it probably going to cost you arm'n'leg to ship it out. Sounds like you got a great deal on that Anker battery and even after de-rating you should still get 3 full chargers of Note 2. Regarding charging time, just look at it this way, your rating is 13000 mA-hour. The input to this Anker E4 is 1500 mA, and that's how much current it will take every hour so 13000 / 1500 = 8.6 hours. I think it will be closer to 8 hours of charging. Your wall Samsung charger is 2A which means it can supply up to 2000 mA of current which is plenty for battery's 1500 mA input to charge it at full rate. But if you are using a wall charger rated at 1A or an old phone charger rated at 500mA-750mA - your input will be charging at a much slower rate because AC charger will not be able to supply full 1500 mA amount. Probably charging overnight is the best idea if you are worrying about someone taking it away. But these things are so small, and even with stock usb cable you don't have to be next to outlet. Probably put a newspaper over it or something when you are away? These don't get overheat even considering 30% of energy loss.

vectron said:
Uh, totally forgot m8, you are Down Under I know it has been mentioned before by others that shipping outside of US for some products could kill the price. Or sometimes you can't even get the product shipped out; there is a thread started by another member from Australia about getting Zerolemon 9300 mAh battery.
I was about ready to suggest another battery from Yoobao (genuine) rated at 15,600 mAh for $60 from Kevikev, but it probably going to cost you arm'n'leg to ship it out. Sounds like you got a great deal on that Anker battery and even after de-rating you should still get 3 full chargers of Note 2. Regarding charging time, just look at it this way, your rating is 13000 mA-hour. The input to this Anker E4 is 1500 mA, and that's how much current it will take every hour so 13000 / 1500 = 8.6 hours. I think it will be closer to 8 hours of charging. Your wall Samsung charger is 2A which means it can supply up to 2000 mA of current which is plenty for battery's 1500 mA input to charge it at full rate. But if you are using a wall charger rated at 1A or an old phone charger rated at 500mA-750mA - your input will be charging at a much slower rate because AC charger will not be able to supply full 1500 mA amount. Probably charging overnight is the best idea if you are worrying about someone taking it away. But these things are so small, and even with stock usb cable you don't have to be next to outlet. Probably put a newspaper over it or something when you are away? These don't get overheat even considering 30% of energy loss.
Click to expand...
Click to collapse
I paid $49 + $9 shipping - a bargain in my book. All the other batteries are $50 to ship, which is about the price of the unit itself!
I think i will stay away from Yoobao from now on haha. 8.6 Hours is OK, it doesn't need to be fully charged at all times - just enough for a quick recharge in an emergency situation where i can't find a charger or provide another 3-4 hours battery while im kicking it on the train for 6 hours.
I couldn't get the Astro 3 anyway - even if i was looking for a 4-5 hour AC charge.
Looking forward to testing this badboy out!