Recently my MP3 Player has stopped working completely, it wont charge from my laptop or turn on. Now the product's information says it takes an Lithium-Ion Battery that can be used for up to 25 hours. So that means it does need to be changed since it stopped working for no apparent reason, correct? Now for battery replacement, is there a certain size or model of Lithium-Ion battery I need to buy? I'd appreciate any help I could get.