This morning I checked out my ISS battery status. I last replaced that 3 volt battery 3 1/2 years ago. First, I checked WeatherCat Tools | Station Hardware options, where WC told me that the ISS battery status was Good and I had all green bars. Then I went outside to the ISS and put a volt meter on the battery under load. The meter showed 3.1 volts, which is what it showed when I first installed it new. I know many WeatherCatters change that battery every year, but I am too cheap to toss a perfectly functioning battery. I got almost 7 years out of the first battery I ever used in this ISS. Besides, I like the challenge of replacing it during a snowstorm in the heart of winter.