7 amps is fine for most smaller packs. what is your wattage requirement for charging? (just a refresher, watts = charge rate (amps) * # cells * 1.5) That power supply puts out 84 watts, so just keep it below 60 watts or so and that supply is fine.

unless you are flying some high cell count packs you won't hit that anyway with a 4/5 or 8 cell pack.