The default battery indicator coming with the HD2 (and the majority of devices, regardless if they’re WM6.1 or 6.5) is rather bulky in indicating the exact amount of juice left.

You can replace that by a new battery indicator which shows 1% battery increments so you know exactly how much power your battery has, from 100%…99%…98% and so on. Just install the cab provided and soft reset your device.

(Source XDA Developers)