If you have WM5, then see -
http://www.totalpda.co.uk/forum/showthread.php?t=5480
Some power saving tips:
- Under settings (power), ensure device turn off after.... is enavbled and set to a really low value. IE 1 minute. Also set the slider to give more standby time. The slider allows you to have more running time, or more standyby/backup. You simply set your own balance.
- Reduce LCD brightness when on battery power.
- If you use credant, also set power off options and encryption (with close application option) to equally low values.
- Leave WiFi and BT in flight mode unless in use. If your device powers on, and these are active, your device will drain within a matter of 2-3 hours continuous use.