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"17 C" ? 17 times the speed of light?

Reversing your math it seems you are implying 17 cycles per hour? Why in the world would you charge and discharge a battery 17 times per hour?

I don't even think it's possible to do that - it takes longer than 3.5 minutes to charge a battery.

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I suspect that C is "charge rate", but I'm not sure how that interacts with battery lifetime. http://en.wikipedia.org/wiki/Battery_charger#Charge_rate

C is the rate that the battery can be discharged (or charged). A rate of 17C suggests the battery can be fully discharged in 1/17 hours. The actual current/power this produces is dependent on the battery itself.

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