Ultimate Lithium never runs out of power. Based on standard use, they’re 100% leak proof to protect your work site devices. And, if you work outdoors or in environment where the temperature may vary, these batteries operate in temperatures ranging from -40ºC to 60ºC (in high tech devices). With a shelf life of 20 years and up to 11x longer lasting power, you can count on Ultimate Lithium for all your device needs. * 4-pack of Energizer Ultimate Lithium AA batteries. Double A batteries. * One of the world’s long lasting AA battery * Leak-proof construction protects the devices you love (based on standard use) * Powers your most critical devices - ideal for your smart home devices, outdoor surveillance systems, digital cameras and handheld games * Holds power up to 20 years in storage for trustworthy backup energy, so you’re always prepared