Thunderpower 40C 'Pro-Race' Battery Charge Rate

[SpEEdyBL]

I charge my 4s Zippy 25c batteries at 2c, and only at 2c, no more, no less. When they were new, they took just over 4500 mAh to reach 90%. After three months and about 15 race days with about 2 or 3 charges on each pack per race day, they take just over 4300 mAh. Not bad since they were only $60 each. performane and temps are still the same. internal resistance has gone up from 18-22 to 24-28 mOhms.