The 3-volt Rayovac® Lithium Photo Battery will keep your device running stronger and longer. It's especially ideal for digital cameras and other notoriously high-power-drain devices. This single Rayovac lithiumbattery has a much higher energy density than some other models, so it delivers a steady 3V of power. The battery is also mercury-free and very dependable. Dimensions; 3.5" x 5.8" x 3.5".