If you’ve already tried a new battery and it still refuses to charge, then it can only be 1 of 3 things.
- The new battery is bad (unlikely, but possible).
- The charging circuitry of the player has failed.
- Your computer’s USB port is not putting out enough horsepower to charge it.
Have you tried using an AC - USB charger rather than your computer. Or maybe trying a different computer (a friend’s or work)? If it shows that it’s fully charged though, and 3 days later it’s dead, I would suspect the battery. If the problem lay with the charging end of the equation, then it wouldn’t charge up in the 1st place.
Updating the firmware would have no effect on this condition, nor would formatting it. Lithium-Ion batteries can, and do start losing their charge from the git-go, whether they are used or not, so although you might have bought what you thought was a ‘new’ battery, it might well be several years old by now and is no better than the one you are replacing.
