I think the original battery lasts about 6-8 hours of music playing. The replacement battery is a BL-4C nokia type, I bought 2 for 4 euro off ebay, 1900 mAh! Haven't tested them yet, coz I had to send the 2 dead players back, will have repairs or new in about 4 weeks. There is a little thingy where you can put a lanyard on, battery side top, you can see it in the middle picture in the lucky draw.
http://www.mympxplayer.org/lucky-dra...ck-vt2404.html