Curiosity: Why extreme temperatures mess with your battery.
you probably don't even think about the battery in your phone, or your car, or your flashlight—until it stops working. Often, that's when you're getting around the campground in the peak of summer or snapping a snow-angel selfie in the dead of winter. Why are batteries so sensitive to harsh weather? It's because inside each battery is a tiny chemical reaction, and chemical reactions are very dependent on temperature.