Gus, Yes you don't want to be overcharging the batterys. However since it is impossible to know how much charge is left in the receiver batterys after a days flying the easiest way to make sure you have a charge for the next day is to put them on a C/10 charger(140ma rate for 1400 mah pack) and then remove the charger before heading to the field. This may add a few extra hours more charge to the pack that isn't needed but at this rate and charge time won't hurt anything. If you leave the same batterys in the same plane it can be checked how much is taken out of the battery but I have different planes and packs so its hard to keep track of. I have several battery packs and check them a few times a year with a Sirius Super Test just to make sure nothing is going bad. I also run "Hobbico Volt Watch" in most of my planes. [8D]