The USBCell company is releasing a type cellphone batteries concept which you can charge the battery directly from USB without chargers or adapters. All you got to do is removing the back cover of your cellphone and plug in the extendable USB plug to the USB port of your computer. But I see this won’t help much is saving spaces, rather get a USB charging cable will be more convenient. Also, you be facing difficulties in answering the phone as the cable is kinda short. But there’s one good point and that is the battery can be removed and charged via USB without getting a desktop charger.