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I Made a Long Duration Li-ion 18650 Battery for my RC Airplane | Li-ion vs LiPo

I made this amazing battery pack using 18650 cells, performing about 3X better than a LiPo battery of roughly the same weight ...
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Fix or modify your LiPo battery

If You have an almost new battery and for some reason it stop working, like after a crash, there is still hope to recover it, ...