Build Battery for 230 mm 36V Li ion Cordless Brush Cutter Craftsman

I bought this battery weed eater from a Chinese online store without batteries and charger for about $15. I think I lost money because I could not find the battery, but luckily I came up with this method. I think it is profitable that I can use this new battery with other power tools.
You can find items in this video in the list below:
Battery Weed Eater ---------- t.ly/E3wo1
42V Battery Case ------------- t.ly/dTMGx
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