kottty, eone,

The best i got was 80 hours (with about 17% battery left).

Very moderate use... a few calls, sms, casual gaming (less than 30mins), downloaded a couple of apps, a few pics (with Vignette).

NO taskiller, NO juice defender type of apps....non-rooted.. just original condition.

Settings:
Background data - OFF
Auto Sync - OFF
Mobile Data - ON, 2G
(everything switched to ON/3G only when downloading and updating apps)

PS:
Arc has good battery life (much better than my Desire HD). For those who thinks that the battery life is not good. Check what is draining your battery.

The first thing to check is the camera. After you use the stock camera app and exit the app, battery will still continue draining quickly.

Also, check whether your Auto Sync is too frequent etc etc.