Mr. Black from Team Orion has said both the 3200 and 4800 batteries can safely be charged at 2c (and he's stated this will be soon...if not already updated on their web site.)
I use the 6.4 amp setting for my 3200's, you just scroll through the settings to set the battery type (LIPO) the Mah Rating (4800) and the charge rate (9.6 amps)
Then select charge.