For testing purposes, I've tried the vacuum without a battery protection circuit.
The performance was good, but not the best. The battery capacity seems to be enough for ~10-15min, but the cheap "9900mAh" batteries are getting warm after ~30s.
The next try will be with 2x2 batteries (1+1||1+1), so this is the added 2nd battery holder:
![](https://cdn.hackaday.io/images/6019071569771019450.jpg)
I will measure the runtime with 4x2Ah cheap cells and 4x3Ah good cells.
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