If it says "lithium" somewhere on it, and "12.6 volts" it should be correct.

 

If it says "lithium" somewhere on it, and "12.6 volts" it should be correct.

Ok Thanks.
Just waiting for 2 more BMS boards. I dislodged what looks like a diode trying to get 6 cells plus the bms into the battery case but it was too much volume. Now I have super glued 3 cells into battery holders

 

If you have the space, it’s fine.

Thank you.
I have finally been successful in converting .my 12volt Bosch Drill to Lithium batteries.
One crucial factor was orientating the BMS board onto the 3 cell battery pack. The BMS board must be added in a portrait fashion , that is the long side of the board on the long side of the 18650 cells. If the you align the O volt terminal of the board with the 0 volt terminal of the battery pack everything falls into place. The 4.2v terminal align. The 8.4v terminals align and the 12v terminals Align . It then remains to sold the BMS terminals to each other. The keeps the connections very short keeping the volt drop to a minimum. It also makes for a compact battery pack.

I did appreciate this until well into the project. I went down a few blind alleys.

I bought a cheap lithium charger as advised and soldered a small lead and socket to the charging terminals of the board . Then s drilled a small hole in the battery case to take the socket and soldered the discharge lead in and when assembled it all worked.
I am so pleased and I want to thank everyone for their input and advice. Project successfully completed. Not really economic but satisfying!!
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did

I did not