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I realized that charging my HTC Desire (Android 2.1) takes longer if connected to computer compare to power outlet.

Does it matter which method I use to charge in terms of battery life time?

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I would be interested in whether there is any impact to the life of the battery based on charging using one method over the other. Any suggestions or links? –  mfg Oct 4 '10 at 11:09
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up vote 19 down vote accepted

No, the battery doesn't care how it got charged in terms of a given charge. It just takes longer when using your PC because it's getting less current from the PC than the AC charger.

Here's a post on android forums which suggests that the current coming from the PC is significantly less than the AC charger. The forum posts list 100mA or 500mA for the PC's USB port vs. 1000mA from the AC charger; these numbers could be off but the point is correct. I also found this regarding the same phenomenon with the iPhone 4.

So using the AC charger is just a matter of whether you want the phone to charge quicker or not.

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nice explanation. Thank you –  Radek Oct 4 '10 at 3:23
    
You're welcome. It was a good question, some people might use the AC charger if it's slightly faster although using a PC is more convenient at times. –  gary Oct 4 '10 at 12:51
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I'm not sure this is correct. Charging faster will generate more heat, which affects battery life, as will charging while in use. –  Matthew Read Apr 19 '12 at 16:19
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