Will putting batteries in a refrigerator increase in life expectancy? The answer is yes, but it depends on the type of battery were talking about.  For example, alkaline batteries storing in refrigerator will extend the life by little less than 5%.  However, if you store them at room temperature.  It will retain about 90% of their power.  You can’t use cold batteries, that is right away, they have to return room temperature, so it’s like storing alkaline batteries in refrigerator doesn’t make sense for example, if you need them.  But if there’s a power failure and you want to put them in your flash light it right away it would render them unusable

However, for nickel cadmium batteries refrigerating them is far more useful, when you store a nickel cadmium battery at room temperature and they lose their charge after just a few days.  However refrigerated they retain 90% of their charge