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2 Amp USB Wall Charger for faster charging

OP zmore

21st July 2012, 12:32 AM   |  #1  
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UPDATE: I've tested and verified that a 2amp charger isn't any faster than 1amp.

The charger that comes with the S3 outputs 1.0 amp (5V), and my old Galaxy S1 Captivate came with a 0.7amp charger. Both are better than the measily 0.5amps that most computer USB ports output, which is barely enough juice for the phone to break even (let alone charge) when you're using your phone with the display brightness at 100%. Obviously the fastest way to charge is with the phone off, or a spare battery, but most of us don't do that.

How many of you are using an aftermarket 2amp usb wall charger without issue, and have you measured how much faster it charges? Also, will this faster charging reduce the S3's battery life, or is it within tolerances and Samsung just cheaped out on the included A/C charger?

As long as it's safe, I'm thinking about buying one of these $10 2amp chargers off amazon...


UPDATE: I read elsewhere that a 2amp charger can't really hurt your phone because there's obviously "smart" circuitry inside that limits the current anyway. If it really is smart, then the upside to 2amps SHOULD BE that when you're charging with the screen on @ 100% brightness, that more juice goes to the battery with the "extra" going to the display, instead of subtracting from what the battery gets.

Quote:

Short answer: the two amp charger won't hurt the phone, plus it also is highly unlikely it will charge any faster on this particular phone.

The preceding discussion applies to "dumb" chargers and batteries (which ShannonPricePhoto pointed to a few posts ago). Increasing the charge voltage causes the battery to draw more current depending on the state of charge. The trick is we have both a smart charger and a smart battery in his phone. Lithium-ion batteries actually contain circuitry to prevent them from being overcharged inside the battery.
The cell phone industry has agreed on a worldwide standard cell phone charger as follows: it uses a micro USB connector (not a mini USB) they all charge at 5 V, the smart controller for charging the battery is inside the phone, and it determines how much voltage the battery receives during the charging cycle. (Not the charger, like a dumb charger used to charge a car battery, which changes its output voltage)

The standard allows for charger supplies ranging from 300 milliamps to 1 amp, and the phone can actually inquire what the capacity of the charger is through the USB data line.

Reading the standard makes me wonder if using the larger charger would allow the phone to take advantage of the full 2 amp capacity of the charger. One post indicated that older devices that were not covered by the cell phone standard may likely have charged quicker with a two amp charger, but I seriously doubt your phone will because it wasn't designed to do so. This however is an educated guess. One way to really find out is get two chargers and compare by measuring the actual current?

For even more reading
The first website discusses the standard mobile phone charger, the second discusses batteries.
Universal Serial Bus - Wikipedia, the free encyclopedia
battery myths vs battery facts - free information to help you learn the difference

I'll update again later with BATTERY STATS when I get my charger...
Last edited by zmore; 25th July 2012 at 08:54 PM.
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21st July 2012, 05:25 AM   |  #2  
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I'm using Andru... it's an Android Shaped USB Charger at 2.0amps... thanks for reminding me because I need to get an extra one...

Edit:

Input: 0.2A
Output: 1.0A
Last edited by deedscreen; 21st July 2012 at 06:45 AM.
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21st July 2012, 05:51 AM   |  #3  
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Quote:
Originally Posted by deedscreen

I'm using Andru... it's an Android Shaped USB Charger at 2.0amps... thanks for reminding me because I need to get an extra one...

Hah - cute, but are you sure yours is 2amps? The only one I can find is 1amp, and kinda pricey @ $25 (or $22.44 on ebay).
Last edited by zmore; 21st July 2012 at 05:55 AM.
21st July 2012, 06:08 AM   |  #4  
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Well, I can't say for sure for the retail version. I am a Journalist & Product Reviewer at ACS, (ACSyndicate) so I got a beta product to test and review...

Q: Am I crazy for going on the S3 Forums all the time, and planning for my upgrade in June???

Attn Mods: I'm not spamming, just making a point... *Just for those snippy mods, if they exist... *
21st July 2012, 06:08 AM   |  #5  
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I'm gonna check right now..
21st July 2012, 06:15 AM   |  #6  
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Guess I'm stupid... mine is 0.2amps... Well, Time for me to upgrade my charger, all though Andru is cute! LOL

I feel stupid now... It doesn't charge slowly though...


Edit: :banghead: WTF? I'm stupid! I read the input... the output is 1.0A... sorry guys... realllly tired.
Last edited by deedscreen; 21st July 2012 at 06:46 AM.
21st July 2012, 06:15 AM   |  #7  
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According to this article:

http://www.extremetech.com/computing...our-smartphone

you should be okay ...
21st July 2012, 06:28 AM   |  #8  
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http://www.shopping.hp.com/en_US/hom...-&rwCategory=-


2 amp charger designed for the hp touch pad. $10.24 shipped. You might be charged sales tax. Mine is faster than stock, I think, but I haven't timed it. Also comes with quality usb cable.

I bought 1, then two more...

Sent from my SAMSUNG-SGH-I747
21st July 2012, 06:30 AM   |  #9  
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Quote:
Originally Posted by deedscreen

Guess I'm stupid... mine is 0.2amps... Well, Time for me to upgrade my charger, all though Andru is cute! LOL

I feel stupid now... It doesn't charge slowly though...

:banghead: WTF? I'm stupid!

Thanks for fact checking, like all good journalists.
21st July 2012, 06:36 AM   |  #10  
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All I know it's that the phone barely charged last night streaming Pandora. I actually had to turn it off to get out to charge to 100%.

Sent from my SCH-I535 using Tapatalk 2

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