I bought package of 4 AA Energizer Lithium Ultimate batteries
the other day on eBay. Exp. date was like 2025. First time trying
Ultimate model. I always used Lithium batteries in my weather station
outdoor. Usually lasts way more than a year but this ones failed in two
weeks. I could hardly measured voltages when I took them out. First
thought was they must be fake ones (maybe from China). Back with
advanced model. Interesting to note from CR, they rated advanced ones
ahead of ultimate ones which costs few bucks more per package.