i have had mine since 11 December. I put over 2000 books on once it had a full battery. it took over 6 hrs to process so turned itself off some time in the night. have used wifi and read every day for at least 2 hours with back light on 1% (done about 21 hours reading)when in bed or dim room and charged it on 24th as it had gone down to 6%. so overall am impressed with the batter as its done alot in its so far short but much loved life
