Battery Tender uses low current smart charging.

by Kim Santerre

As more variations of wet cell batteries come into the marketplace—sealed absorbed-glass mat types, mainly—we’ve seen a profusion of so-called “smart chargers” intended to prolong their service life by avoiding ruinous overcharging. But do they actually work as claimed?

Yes, generally they do and considering the cost of replacing an aircraft battery, they’re probably worth the modest investment, especially for airplanes that are flown frequently. …