Alkaline-manganese dioxide AA battery Quantum batteries are designed to last longer across a range of devices Features PowerCheck - allows you to see the remaining power on the battery at the push of a button 10 year shelf life guaranteed (each battery is individually date coded to ensure freshness) Measures 0.61-inches length by 7-3/4-inches width by 4-1/2-inches height Duracell Quantum Alkaline-manganese dioxide battery. Reliable everyday power. Get dependable, long-lasting power from Quantum batteries with Duralock Power Preserve Technology. These batteries have been engineered to deliver just the right level of power for most of your household needs. Plus, they now have up to a 10-year guarantee in storage. Many of the devices you use in your home are powered most efficiently by Duracell Quantum, including toys, clocks and radios, remote controls, smoke alarms, flashlights, portable electronics, calculators, wireless mice and keyboards. Equipped with more active material than any other alkaline, This will increase your productivity and reduce your operating costs.
So far so good. I do get much better life out of these batteries but twice the life seems to equal twice the price or so. Once the price comes down and these become the new standard they will be worthy.