I found this post under the:
MyMPxPlayer.org Forum » Mods and Themes
http://www.mympxplayer.org/new-batte...ne-vt2313.html
Looks like it will work. I have seen a 400mAH in Maplians for £9.98
http://www.maplin.co.uk/module.aspx?...8938&doy=14m11
When I get the mp4 player I will check it out and keep you posted