I set shutoff at 3.61v to match LiftDrive, brightness at minimum, and read ebooks on SD card (plus minimum other activities), I got 7-7.5hr out of a full charge (4.15v+). I don't have exact number of my battery capability prior to this app. But it was slightly above 3hr. So it's 100% improvement for me. WIth 7hr+ battery time, I'm now seriously considering buying the WiFi card. I'm sticking with my T3 until a real upgrade comes (LifeDrive with real RAM and video out, and maybe in some more advanced format such as integrated mega digicam or GPS). BTW, you can use Profeo SA to disable default battery warning and use your own settings instead. As I set my shutdown at 3.61v, I set Profeo to warn at 5% battery level instead (some half an hour of minimum brightness runtime left before actual shutdown). 3.61v is very safe. Data loss won't occur till around 3.4v.