Cold batteries - rate of reaction

A lovely view of the Scafell group from High Raise. But I was down to my last set of batteries. Batteries don't perform as well at low temperatures because they rely on chemical reactions to release electrons. The flow of electrons are the current supplied by the battery. At low temperatures, the molecules have less kinetic energy and move more slowly. They collide less often and with less energy so fewer reactions can happen. Too few electrons are released to operate the camera. Oh well.