I have 3 headlights and 3 taillights. When I ride I usually use 1 or 2 of each but still carry all for backup if the trip is long. All the lights have batteries installed. That means some of the batteries in the lights have never or rarely been used for months (I don't rotate among the lights, instead I use mainly one and the same the most). Since cold temperature such as in the refrigerator prolongs batteries' lifespan, would it be good to keep the lights in the fridge when not using them? (Taking the batteries out repeatedly is too much a hassle.) The lights themselves won't be harmed by the cold temperature in the fridge, methinks?--although I doubt many people keep their bike lights in the fridge .