Originally it have BR2032 battery with spot welded tabs – it’s quite hard to get in normal price so i have use “glue wire” to stick tabs onto battery.
Do not use soldering iron – because heat will damage battery.
If You don’t have spot welder – glue wire – is great for low current application – like in this scenario!
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.
