Brightown CR2032 battery does great in battery operated fairy lights, ideal for Watches, Calculators, Key Fobs, Apple TV remotes, Alarm clocks, Computer motherboards, PDAs, Electronic organizers, Garage door openers, Toys, Games, MP3 players, Digital voice recorders, Door chimes, Pet collars, LED lights, Sporting goods, Pedometers, Calorie counters, Stopwatches, Glucometers, thermometer and other small electronics