BonnyMP4 , you should be able to find a suitable manual in the downloads section here
http://www.mympxplayer.org/documenta...nuals-dc5.html
They are all generally about the same, perhaps the difference would be the screen images.
Depending on your firmware version number, you could perhaps do an extraction, repair, re-flash, and maybe the battery problem might get fixed.
But if the version number is higher than v9.0.43, then you can't really do anything as the tools does not support any higher.
Also, do not do any firmware updates as it would likely brick your player.