[suicideneil]

If the cell is rated at 1c charge, the thats all you should do. Newer cells with safer chemistry can accept upto 5c, though 2c is more the norm; follow the instructions on your specific packs.

Generally, a 4900mah pack could be done at 5amps and be safe, but if you cant wait one hour for the pack to charge (at a race for example), then you need to buy some more packs so you have a continuous supply..