Way back on February 8, I received and installed some Energizer Ultimate Lithium AA batteries in our front-door Kwikset electronic deadbolt. Standard AA alkaline batteries were only lasting a few weeks, particularly in the cold weather, and I was tired of changing them all the time. So I thought I’d try something different.
That set of four batteries has never been changed. In fact I ended up using the rest of the batteries in the pack of 8 for other things. Then I bought another 8-pack in May, thinking that eventually I’d have to change them out. Still haven’t done it, and I’ve used three of those for other things.
That’s 8 and a half months on a single set of lithium batteries for something that was eating alkalines like there was no tomorrow. I’m impressed. I knew lithiums were better, but I didn’t know they were that much better.