ORIGINAL: bigtim
thats part of the reason i have been installing Voltwatch devices in my planes to watch the charge levels on the batterys, if I charge one up and a few days later the voltage has dropped I know there is something wrong, and I check the battery.
I have a maintenance cycle for my batteries. About once a quarter, I cycle each battery and make sure I top it off with a trickle charge. I do this with other batteries around the house, too.