I removed the 2 last cells of the J-shape battery, then the plastic bith that secures the gearbox down , I didn't modify it , I just lmade a little plate in Aluminum that secures the gearbox and doesnt take alot of space
then I solderd the 2 cells to the rest but with a little bit of wire in between, then i placed the battery and with a glue gun, I glued them togheter, now I got a perfect fitting battery pack!
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