Makita 12V BL1050B Battery Housing (21700 Cells) - 2 Year Test

I made this Makita 12V BL1050B battery two years ago - before the official BL1050B came out. This design took me around 12 hours to model. I used a BL1021B battery, which uses 18650 cells, as a reference, and modified the dimensions so it fits 21700 batteries. During the 2 years of usage I had to replace one housing after it broke from a fall. You will have to source your own PCB, 0.2x14mm copper Strip, M2x6 or similar bolts, and the spring - I got mine from Aliexpress.

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