Thesebatteries have chemical inbalance within the packs. I have purchased 8 seperate 4s 4000mah packs and 4 5s packs of the same size. out of the 12 packs only 3 survive after 18 months.these batteries are great when delivered but garbage just as quickly.... any stories are welcome and i will pass them on so no one else gets burned on these low quality packs....
happy flying.
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