what sytem you running esc and motor ? you need bigger mha 5000mha plus and a good c rating about 35c to 50c . that why your batterys only lasting 7mins . my 3000mha 35c last 20 mins i dont know why your get so sort of a running time etc . and try turn your esc down etc if you can . i got 4s lipos forsale that like new
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