This is the 21700 Molicel P42A 4000maH Lithium Ion (Li-Ion) batteries set up in a 6S1P battery pack with 12AWG wire connecting the cells by soldering.
I will be using these on a 10" quad copter FPV Drone setup. The cruising amps are around 30Amps and one pack can deliver the current required however 2 packs in parallel is what I will be using.

I do not recommend that anyone should make their own packs, this is simply showing what I did.
I do suggest people should buy manufactured packs simply because the manufacturers have the right tooling and equipment to make them safe.
These batteries store large amounts of energy and can potentially explode or cause fires and can cause harm to people and property so handle your batteries with care.

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