HTC Dash 3G HS S200 - Manual (Page 45)

Getting Started 45
To check and optimize battery power
On the Home screen, select Start > Settings > Power > Power Management, and
adjust the backlight, display, or light sensor settings.
If you do not want to charge the battery while the phone is connected to the
computer, select Start > Settings > Power > Power Management and in When
device is turned on, do not charge the battery when connected to the PC,
select On.
To manage low battery
When the low-battery warning appears, do the following:
1. Immediately save your current data.
2. Synchronize with your PC or use the AC adapter to charge the battery.
3. Turn off your phone. Turn it back on only when you need to use it.