Is it because you were on the dedicated graphics when on battery? I noticed my T400 with switchable graphics does not switch automatically when I run it on battery and the battery life is also very bad. But once I manually switch it to run on the integrated card, i can get excellent battery life.My 6 cell batt for t410 only last 2hour 10mins. If heng can last 2hr 30mins
Sad batt life