How did i fix the Ryobi One + battery?
The battery originally had 1.5Ah/1500mAh which was enough to do some things but after a year i could only make a couple of holes before the battery would show me low capacity, after some research it was clear that i needed to substitute the cells inside the battery.
What cells did i choose to substitute the old ones you may ask, i had lying around some second hand 18650 cells with +/- 2.5Ah/2500mAh capacity which is actually quite an upgrade from 1.5Ah/1500mAh.
The battery is hold together with Torx T10 screws, there are 5 screws. 4 screws in the base and 1 in the power leg.
Now we only need to very carefully remove the nickel strip tabs of the cells and remove the 4 screws of the circuit board to remove the board from the plastic between the cells. After this is done we can remove 2 hidden screws and substitute the individual cells, now we can assemble the plactic and put the circuit board back in place.
We can now hot spot weld new nickel strips to the 5x 18650 cells and resolder the individual wires going to each battery to keep the voltage balanced.
We are almost done, check if the capacity leds light up and what the output voltage is on full cells it should be close to 21 volts and close everything up and we have basically a new battery with higher capacity.