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Charging is different on laptop vs the electrical outlet?!

Why? Lately I’ve been complaining that my Desire’s battery is only running a 5,5 hrs charge with my usage, which means I started holding back on “Internet consumption” and talking on the phone. And that’s not right: I use it because it’s a smartphone and I want to do more with it, not less! And I’ve tried everything: car charger, switching off applications, various juice-saving applications, turning the light down, switching off Bluetooth, Wi-Fi, not to mention I don’ t use the GPS module because of the power issue. Nothing. If I use the Desire just for a few short phone-calls and some emails, I get 12 to 14 hours out of it. But then it’s just a dumb Nokia 1100! If I wanted a damn calling brick, I’d have surely gotten one! I thought I’d do a little experiment: USB cable charging from the computer versus he electrical outlet! I use the same USB cable; for the electrical outlet plug, I just insert it in a plug adapter. And it’s like this: 40 minutes charge with the phone connected to the  electrical outlet resulted in 35% surge. 40 minutes charge with the laptop USB cable resulted in a 13% surge. Why, oh man, why?!! Why is the Desire different than any other mobile I know (except for the Nokia crap)? I wish I had an electrical outlet everywhere I go but I don’t. Is HTC aware of that?

Later update: I found the answer: Aragorn’s . Quite simplistic but it illustrates the solution perfectly.