Energizer 522BP1 Max Alkaline 9 Volt Battery is up to 50% longer lasting. Just what you need to power your family’s favourite devices. Designed to protect against damaging leaks for up to two years after fully used. Hold power for up to 05 years in storage. From the makers of the world's 1st* Zero Mercury 9 Volt Alkaline Battery: Energizer is an industry leader in powering people's lives responsibly. PowerSeal™ Technology is the Energizer® innovation that delivers energy you can rely on.