HTC에서 제시한 충전법

The following steps should significantly extend the battery life on your phone. 
- Connect the phone to the charger with the phone powered on, and allow the phone to charge until the notification LED is green, indicating the device is fully charged.
- Disconnect the phone from the charger, and power it off.
- Reconnect the phone to the charger with the phone powered off, and allow the phone to charge until the notification LED is green.
- Disconnect the phone from the charger and power it on.
- Once the phone is powered completely on, power it off again and reconnect it to the charger until the notification LED is green.

This need only be done once for a battery.

간략번역:

- 핸드폰을 켜놓은 상태로 충전이게 연결 후 충전 LED가 녹색이 될 때까지 충전한다(90~100%)

- 핸드폰을 충전기로부터 분리한 후 전원을 끈다.

- 전원이 꺼진 상태로 충전기에 다시 연결하여 LED가 녹색이 될 때까지 충전한다.

- 다시 분리한 후 전원을 켠다.

- 전원이 완전히 켜진 후 다시 전원을 끄고 충전기에 연결하여 LED가 다시 녹색이 될 때까지 충전한다.

배터리당 한 번만 하면 된다.

출처 : http://www.androidpub.com/?mid=phone_nexusone&category=99046&document_srl=694311