Flightpower 4900

I've email Flightpower and the guys at Flightpower tell me that we can charge their pack to 2.5C without any porblems. The only downside is that if you charge it at more than 1C each time you use it, you'll decrease the lifespan of your pack.
So your 4900mAh can be charge at 5A thrue 12A without any trouble