Energizer Ultimate Lithium AA batteries are the world's No.1 longest-lasting AA batteries. They'll power your most critical devices including smart home devices, outdoor surveillance systems, digital cameras and handheld games. Their leak-proof construction protects your device (based on standard use) and they'll perform in extreme temperatures from -40C to 60C for year-round, indoor and outdoor use. These batteries will hold power for up to 20 years in storage, giving you trustworthy backup energy, so you're always prepared.