Long-lasting power & innovation is what the Energizer MAX family is all about. Energizer D batteries hold power for up to 10 years while in storage, so you have power when you need it most. When it comes to toys, portable radios, flashlights, & other valuable devices, you can feel confident knowing you have the long-lasting power & protection you expect from Energizer. Battery Type: Alkaline; Battery Size: D; Voltage: 1.5 V; Material(s): Alkaline Manganese Dioxide.