From the Manufacturer

Duracell Coppertop AAA Alkaline Battery with Power Boost Ingredients

Duracell is the #1 Trusted Battery Brand

Duracell AAA Coppertop alkaline batteries are guaranteed for 12 years in storage.

PowerBoost™

Duracell Coppertop

Duracell Coppertop AAA batteries with POWER BOOST™ Ingredients deliver dependable power to your everyday devices throughout the home, like toys, remote controls, flashlights, calculators, clocks and radios, wireless mice, keyboards, and more. With a guarantee of 12 years in storage, you can rest assured they'll be ready when you need them. Duracell guarantees these batteries against defects in material and workmanship. From storm season to holiday needs, Duracell is the #1 trusted battery brand for the moments that matter most. 
Duracell CopperTop AA and AAA alkaline batteries with Power Boost Ingredients are not only dependable, they’re also long-lasting. So, they’re great for many of the devices you use on a daily basis. And you can take comfort in a 12-year guarantee in storage. From storm prep to medical devices to holiday needs, Duracell is the #1 trusted battery brand so you know it’s a battery you can trust.     

*vs previous Duracell Coppertop across a wide range of AA/AAA devices and consumer usage habits
**See Duracell.com/guarantee https://www.duracell.com/en-us/technology/battery-care-use-and-disposal/ for details.