I have a history of causing early death to lead acid batteries. I currently have 3 batteries that are mostly unused. One gets used every month or two, and will be used daily in the winter. One will remain mostly unused until next spring. The third is a spare. I want to keep them all from becoming useless but I only have one smart charger.
Well, I wrote it off as a business expense... A fringe benefit of buying stuff @ Grainger. The battery in the Buick is nearly $100. I buy the best & biggest battery Wal-mart carries, and I always seem to kill them stone dead before the warranty runs out. I bought one 10 years ago, and have been getting free replacements ever since.