Charging at 2C-3C is safe for sure in batteries that can handle them if not you can rest assured that certain lipo companies who are minting money will end up bankrupt. The batteries are rated for such charging rates. Still I am not keen to charge at those rates because it not worth killing the batts. Better to buy another pack.

opjose - thermal probe is not the be all and end all ... hehehehe ... probe failure ...

CGr - some people live in bunkers