Damn. That’s not a simple battery!
And it smells burned
I assume you can separate circuit from cells?
https://gruenesocial-userfiles.nbg1.your-objectstorage.com/media_attachments/files/116/149/50...
@nprofile1q... You might, but when it smells burnt I think it's the circuitry, not the batteries. Better replace the whole thing.
1