That's an odd request. Most of the time charge rates are a factor of capacity. So if you have a 4600mah battery you generally charge at 1C or 2C, which would be 4.6 amps or 9.2 amps respectively. There also batteries out there that can be charged at 5C so that 4600mah could be charged at 23 amps. There are some Turnigy's from Hobbyking that are 5C capable, but I have a hard time recommending them at this point since I'm currently having an issue with a new battery and Hobbyking is providing poor customer support.