Clip Zip Battery

I just looked at a nonworking clip zip and noticed the case separating. The battery bag has expanded like a balloon. Has anyone else had this happen?

Not to me personally, but I’ve heard of it happening.

Do you know anyone that repairs clip zips?

A few people online have bought replacement batteries and then put them in, although it can be tricky since the battery has to be almost the exact same size or it won’t fit: