Milwaukee M18 9ah Battery Build 150$ battery for $25. Amazon case and cells from an ebike.

[@jaronvaughn4520]

All of these batteries are in groups of 5. This is how they get the voltage. 10 cell batteries are 2 in parallel and the groups of 2 in a series of 5. 15 cells would be 3 in parallel and 5 groups of the 3 in series.

[@RealSideQuest]

100% correct.

[@AlexGuo-28]

How is the 9.0Ah battery you built holding up?

[@RealSideQuest]

It has been a workhorse. Lasts longer than the original Milwaukee.