I took it off charge at 07:30 and by 17:20 it was on 63% after an average use day showing people how it worked etc. By 21:15 it is on 50% battery. On 15th Dec I used it for an hour to take notes in a meeting and then again at home for two hours - at 23:30 it shows 50% battery left. After two and a half days I had 39% battery left. See more info and tips on my use with the Tab at sites.google.com/site/dvdmerwe/gadgets/samsungandroid.