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Sorry, but the batter is an internal li-ion rechargeable battery that is soldered into place. IT cannot easily be replaced. You would need to open the unit and remove the existing and solder a new one into place. I hope this is of some help to you.
It could be that your internal Li-Ion rechargeable battery is no longer holding charge and needs replacing or charging.
Check that your MP3 player is functional by turning it on while being connected to your P/Laptop or USB charger.
Also try reseting your MP3 player by pressing the on/off button for 15+ seconds.
Hope it helps!
If your MP3 has an inbuilt Li-Ion battery (e.g. no compartment for a standard/Ni-MH AAA battery), then connecting the player to your computer will normally charge it - this is the case for the PD-6070 'stick' player.
Your player will also indicate that it is being charged (or not charged!) via the battery level/power indicator which is located on the top RHS.
Hope it helps!
If your MP4 player is 'old' or frequently used and you can use it while being connected to your PC or charger, then the most likely reason is that the internal Li-Ion battery is worned and not capable of holding a decent charge: the solution is to replace the internal Li-ion battery: you have to decide if this is economically viable especially if you cannot do it yourself or the replacement battery is too expensive.