Sirr0und Energizer 2Cd 9V Alkaline Battery Lasts longer and performs better. Designed to protect against damaging leaks for up to 2 years after fully used when left in low-drain devices (AA and AAA). Holds power up to 10 years in storage (5 years for 9V). MPN# 522BP-2 SKU# 803871UPC# 39800036780