Fixing battery on the Xiaomi G10 / G9 vacuum cleaner

The vacuum cleaner wasn't working as all the LEDs in the battery and the display were off.
The charger was working as i was able to measure 30v.
I disassembled the battery, and that probably reset something as as soon as I opened a led turned red.
I put the disassembled battery in the vacuum and it turned on. I put it in the charger and it worked.
If you have a similar issue is worth to try, as you don't know if it's the charger/battery/vacuum.
Cheers!
Ricardo