I leave mine on ACE trickle chargers year round. I do have a cycler that I move from one to the next every so often. I also flip them to regular charge the night before I go flying. I could be doing this wrong. I am no expert. However I have no trouble getting 5-7 years life from my batteries. I also keep a close watch on them at the field. Checking the voltage every other flight. even a new battery can go bad.

David