In this video I converted a 12v Makita NI-MH replacement battery to LI-ION. I also found a way to use the original charger without modifying it. The original charger only charges the batteries to about 95%.
I used some battery cells that were in a broken Makita 3ah battery. The battery I took the cells from fell in a bucket of water and the BMS broke but the cells are still fine. You can certainly use new cells if you want.
The battery I made is very basic. All the parts you need can be found online. To find the BMS, just type into the search bar BMS 3S 20A or whatever size you need.
You can also do the same thing for a 14.4v, 18v or any other size of battery but you will need the right amount of cells and the right BMS. You could also make a battery with a higher amp-hour by putting two series of cells in a parallel but you need the right size BMS and the housing needs to be able to fit it.
You could use a battery welder and it would be much better than soldering but I don't have one.
Please modify your batteries at your own risk.


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