You can order a whole new aftermarket battery pack that’s the same size etc as the original - no need to mess about with cells - I had exactly the same issue with exactly the same dyson.
Just two screws and a plug and play battery pack (IIRC!) and it’s been working better than new for over 2 years, still fits in the original charger wall mount et al.
Yeah, after taking apart the battery I decided this was a better idea (I don't have a spot welder). Plus all the brains are in the battery and I was fairly sure I would short it trying to fix it.
Ended up with an Amazon battery for £25 that seems to be working fine.
You can order a whole new aftermarket battery pack that’s the same size etc as the original - no need to mess about with cells - I had exactly the same issue with exactly the same dyson.
Just two screws and a plug and play battery pack (IIRC!) and it’s been working better than new for over 2 years, still fits in the original charger wall mount et al.