[Fool123]

Ok for some few days, I had the same problem where my mp4 only lasts half an hour, The suddenly 1 day I was using it while charging it...So while charging turn on your mp4 player and charge, It might work for you too..Because Once I charged the whole night and battery only lasted like 30 min, So try charging while the player is on or while your using it while the player is charging.