Couple months ago i got myself used AKG T912 headphones. They can be used with regular battery or rechargeable.
Question is how whey prevent from recharge a single use battery when someone stuff it inside.
Answer is a third contact for recharge touching body of battery.
To be able use rechargeable battery, it need to have striped part of battery body to allow third pin contact – and then be recharge.
So if You fit rechargeable battery inside AKG T912 and they not charge – check for contact to body.
On pictures bellow You can see how it works.