9V Batteries 9V Batteries Three powerful choices for Energizer® 9V batteries – which one is right for your device? Compare batteries here… Product Description Features Energizer MAX® 9V Holds power for up to 5 years in storage, so you’ll be ready when you need it most. + Energizer® 9V Ultimate Lithium Batteries Up to 10-year backup battery in AC-powered smoke detectors, and up to 20% longer-lasting in toys versus Energizer MAX® + Energizer® Recharge® 9V Money-saving alternative to buying single-use batteries again and again – designed to be recharged hundreds of times. +