Duracell Coppertop Battery 9 Volt 2 Pack MN1604B2Z. Engineered to deliver all the power you need for a wide variety of devices. Duralock Power Preserve technology for a guaranteed 10 years of storage without losing power. Specifications for Duracell Coppertop Battery - 9 Volt 2 Pack: Manufacturer: Duracell Battery Quantity: 2 Battery Type: 9v Voltage: 9 volts Portable Power Type: Single Use Available quantity options: Pack Package Contents: Duracell Coppertop Battery - 9 Volt Provides dependable long-lasting power. Engineered to deliver all the power you need for a wide variety of devices. Duralock Power Preserve technology for a guaranteed 10 years of storage without losing power.