If you're wondering which ones to buy, I got a pair of batteries from amazon but I think the seller is on ebay as well. The battery on the right is the factory one at 85 mah and 3.7 volts, the one on the left is the one I ordered at 90 mah and 3.6 volts.

Amazon link

Edit 1/27/25 - I've already switched earbuds by now and I don't have these anymore.

Hi, recently one of the batteries in my buds died (checked by switching battery from good ear bud into the supposed bad one and it worked fine) and I haven't been able to find a replacement battery, the ones on ifixit say that they're compatible with just the buds and buds live, anyone know where to get ones that are the right size?

Hi,

In the recent weeks, the capacity of the battery in my buds plus charging case has tanked. While before, I could use my buds for weeks or even weeks at a time, now I have to charge them after just a day or two of my normal use. Now, I know it isn't that bad right now, but it is getting inconvenient.

What I'd like to know is, do they offer spare battery for the charging case? From the iFixit teardown, it seems, that it should be possible to replace it.

I'd like to prolong the lifetime of the product a bit further, but that depends on whether I can get a replacement part.