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Free tool

Battery pack builder

Plan a LiPo or Li-ion pack: voltage, capacity, energy, weight and the current it can safely give.

Cells
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FAQ

Questions

How many amps can a Li-ion pack give?

Each cell's rated current times the number in parallel. A 4S2P pack of 45 A 21700 cells can give about 90 A.

LiPo or Li-ion for long range?

Li-ion packs hold more energy per gram, so they fly longer at cruise. LiPo packs give much more current, so they suit hover and sport flying.

Can I fly with a pack over 100 Wh?

Yes, but airlines limit carrying packs over 100 Wh. The tool tells you when your pack goes over.