Aggressive would be charging at 4-6c which for a 5000 mah pack would be 20-30 amps, Danny does alot of testing with all his packs before he decides to put the SMC name on them, he doesn't just buy packs and slap stickers on like some companies do. Danny's testing shows his packs can handle a 6c charge, of course that will drastically reduce the cycle life of the pack. Danny recomends charging no lower than 2c.