Long-lasting: Xfoxbatt 9v 6f22 batteries are fully charged before leaving factory. Battery life is long-lastingIndividually shrink-wrapped: Easy to use and store, and the batteries are not easy to short-circuit, ensure the safety of your power useLeak-resistant construction: Advanced dual-layer sealing technology minimizes electrolyte leakage risks, protecting sensitive electronics from corrosionOptimized for low-energy devices: Made with carbon-zinc chemistry to deliver stable power for low-drain electronics: Remote controls, thermostats, toys, and medical monitorsWidely used: Smoke detectors, alarm systems, remote control toys, wireless microphones, wireless headphones, guitar pedals, flashlights, garage door openers, doorbells, metal detectors, multimeters, infrared thermometers, medical equipment etc.