Our battery vacuum cleaner Dreame V10 (VVN5) stopped working for more than a few seconds and shows a warning.

I thought it'd be easy to get a new battery, but doesn't seem so. I opened up the battery pack to find 7 Samsung INR 18650 cells and a PCB.

The cells are electrowelded to their connectors with two little dots. Something I couldn't do to replace them to the pack.

So I asked a company specialized in refurbishing batteriy packs and they told me that they wouldn't do this, because once disconnected the PCB would shut down and stop working. They wouldn't be able to bring it back to life.

They can't offer me replacing the cells mechanically, because of - liability and warranty laws.