how to make a 12 volt battery from PVC pipe easily without expensive. For the battery I use a hp battery instead of a 18650 battery, this battery is a 3.7volt lithium battery type.
assembling a 12 volt lithium 18650 battery without using bms 3S 40a so it doesn't cost much to make a 12 volt battery.
Assembling 7 batteries in parallel and 3 in series, so the total battery I use is 21 batteries, so the battery pack is 12 volt
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