Originally Posted by
Davidka
1c= 1x a given battery's mah capacity. A 4000mah pack means 1c=4amps, 2c= 8amps, etc.. A 9000mah pack means 1c=9amps, 2c=18amps, etc..
While some batteries are "rated" to charge at 5c does not mean they should be. 1-2c is plenty fast, safer and attainable for most chargers.
Just to add to this as...
If you charge your Lipos at a lower C rating you are going to see a longer runtime and a longer overall life span, if you charge them at a higher C rating, you will see decreased runtime, and decresaed lifespan, but you will see a slight increase in power.