I really use my touch quite a bit. During normal (2500mAh) battery so around 16:00 (starting at about 7:00 without charger cable) is then final. Longer went only when I used the music as a "normal" mobile phone. So all in and just make calls, send SMS. With the fat 5000mAh battery can i put my note to 23:00 use (of course not in continuous operation). Unfortunately, the music with the power battery is a bit clunky. But that I might live better than with second battery or mobile charger (external battery).