ORIGINAL: Gray Beard
I use an old ACE charger and just leave my planes hooked up to them on trickle charge, ready to go at a moments notice. There was a product called the Little Trickler that you would just plug several wall warts into and it would keep your batteries at a trickle charge.
This is what I have been doing for the last 30 years. I have 4 Ace chargers that charge at a slow rate (C/10) for 15 hours and then switch to a trickle charge (C/50) rate. Also I have added Ace Add-A-Trickle adapters to all of my wall wart charger that provide the same function as the Ace chargers. When I get back from flying I start the receiver packs used on a slow rate. Then 15 hours later the charger switches to a trickle rate which I keep it at until I next go flying. My packs last for years this way and are always ready to go to the field.
Bruce