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Lithium Polymer cells are one of the biggest breakthroughs in electric flight of recent times. High capacity and light weight are the big gains. Recently I met a guy flying a little pylon racer with a Mega brushless motor - he changed from NiMh to LiPo and the performance leap was dramatic - suddenly he had unlimited vertical performance - he could climb vertically for as long as he could see the aircraft!
Early LiPo cells were expensive, and would not deliver high amps. The latest generation Flightpower cells are capable of 20C with 30C bursts - and the price has come down. Just take care with the charging - the charging regime MUST be managed just as the instructions say, or you will have smoke and flames! Handled properly, they will revolutionise your flying.
The chart below lists the Flightpower battery packs currently available. The EVO-400, 800, 1200 designation refers to the mAh capacity of the pack. Each cell is 3.7V, so two cells in series (2S) will be 7.4V, and three cells 11.1V, etc. Each of these packs is 1P, or one lot of cells. To gain 2P (two lots of cells in parallel) you buy two packs and hook them up in parallel. Then you will have double the capacity, and double the Amp capability, but the same voltage. For example, an EVO-1200 3S1P pack will be 11.1V and capable of delivering 24A. Put two packs in parallel (3S2P) and you will still have 11.1V, but 2400 mAh capacity and 48A capability.
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