Like Landeck, I plug all the flying battery's and the field box into the slow chargers after flying, except my timer turns on at 9:00 P.M. on Friday night and off at 09:00 Saturday Morning. So on Saturday Morning If, I go fly I just check the Voltage and go. I cycle every couple months when I remember.

The Main concern for batterys is heat. They are charged when they are warm, so stop charging. Fast charging produces more heat and can lead to keeping the battery warmer for longer[:@], which reduces battery life.

Ref: http://www.hangtimes.com/id30.html.