Edgeomatic

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Hey guys, I am having some problems with power and flight times. I have an axi 2208/34 with a castle creations 8amp controller. I have some 340mah 3cells, a 720, and some 1500 and the only ones that give the motor any power the the 1500's. My small batteries all of the sudden don't hold a charge or the don't put out the power. I use this set up on a shockflyer and all of the sudden everything is going bad. Is the motor shot, the ESC, or the batteries? I use a smartcharger 2500 if that helps.

Thanks for your help