hi gvdgvdgvd
Have a look at my guide here:-
http://www.mympxplayer.org/rockchip-...ap-vt6745.html
you need to have a look at the battery in your player now.
I swopped the battery in my rockchip player with an ipod mini battery and got more than double the playing time.
the voltage is 3.7v and the mAh capacity needs to be as high as you can but you need to see how much space you have got for a bigger battery.
have a look at the mAh rating on the battery if it is 300mAh then you could get double playing time if you use a ipod mini battery at 600mAh, you can get these cheap on ebay.