[lincpimp]

I am sure that charging a 4500 pack at 5amps will be fine. Hyperion actually rated all of their packs for 2c charge for the last year or so, and those are the same enerland cells in the the other high end brand packs. You may diminish the life a bit, but I doubt it will do much. As long as you are using a decent charger you should be fine.