Dating myself here but, DOTA.

Bummer. Thanks for sharing.

Could you kindly point me to some more info on this?

My kids love Kurzgesagt and I generally find the content very informative.

Yes. I just replaced the ones in my wife’s Sony earphones by following a step by step guide on ifixit. Cost me $15 for the batteries including shipping, and they’re not even any sort of exotic type or size.

Edit: okay just read the article. Guess these are a lot more convenient to replace than the Sony ones.