thx. I just seem to remember that too fast of a charge ( using word fast loosely) might be hard on batteries and wasn't sure if these boosters were quick charging or just like a wall plug taking a few hours to recharge a battery. I have four batteries and if i'm flying near power i plug the first discharged battery in and continue with the other 3 and end up using 5 altogether- i fly with a partner and we takes turns. If these remote chargers take a couple hours to charge i think i'd rather buy a couple more batteries...does that make sense other than having one of these units for ither purposes ?