X2, there's a variety of full time battery maintainer chargers out there, they stay hooked up for the WHOLE time, no need to disconnect. As for putting batteries on concrete, it's bunko, get with the program. If you have to replace your batteries every year, I applaud you for propping up the battery industry. Some people don't learn. Batteries discharge more slowly at lower temps, leaving them in an unheated garage is acceptable, but leave them on the charger.