Battery life depends on type of charger When I charge my HTC Sensation mobile with the charger supplied by HTC the battery duration is more or less 1 day (depending of the usage). But (here comes my question) when I charge the mobile through usb connected to the PC, or with the cable supplied by Amazon Kindle, the battery duration is much lower, sometimes a couple of hours.

Could someone explain which is the electrical reason of this behaviour?

Thanks in advance
No. Since you mentioned the battery DURATION is hours shorter, it must be the usage not the charger.