Originally Posted by
bobn
What is the effect of ice cold to heat and vice versa have on the batteries? Perhaps the cycling of hot and cold may cause damage or shorten life??
Storing batteries in a fridge should be a mid- to long-term storage option, not for everyday use. I night ride in the fall and again for a short time in the early spring. The rest of the time my Li-ion battery pack for the bar light is double wrapped in the fridge at about 45% discharged. Prior to using again, I take it out (still in the bag) and let it 'thaw' to room temperature for 12-24 hours. That is the recommended practice vs taking a cold battery and putting it right to use. During night riding season, I'll leave the batteries out. As my collection of flashlights has grown, I'm going to extend this practice to my Li-ion 18650 battery cells, keeping just a couple out for general flashlight use.