Originally Posted by alan666notb
There is a difference, the AC adapter supplies about one amp, a USB socket supplies half that.
However, on AC the phone will charge fully in much less than half the time it takes via USB. This is because the charging curve for Li-ion batteries is not linear, the first 80% (approx) happens at a much faster rate than the final 20%.
oh? really? yeah, i noticed that the first 80% charges fast then slows at the last 20% so, are you saying that it's not always advisable to charge via usb? will it shorten my phone's battery life? i have this habit that i then remove my phone upon reaching 100% even when charged via usb. so how can i determine the "real full charge" when i charge my phone on my laptop? i don't usually bring my charger with me to the office. i just bring my htc usb cable.