Some of the other companies boast you can charge up to 5C but I would never do it. The pack might take it but it ain't gonna last long.
Sorry but I have data to prove otherwise. I have charged other brands of Lipolys at 5C for over 300 cyles and discharged them at rather high rates as in 17C (less than 4 min) to greater than 90% depth of discharge and the capacity decrease was very minimal and the voltage under load did not demish.
The days of less than 3C charges are history IMO and 3 to 5C is my norm with some at 10 and even 12C.