I am not going to pretend to know the correct answer, but do cycle mine once per month. Although in the cold like we have had, I am not making sure this is done every 30 days. I did, however, notice something ironic here. The persons using the batteries in cars seem to take better care of theirs when the only thing that would happen is the car will slow down. On the other hand those that fly have the entire plane to lose, and are less strict. Like I said, just an observaton.