Duracell Alkaline Lantern Batteries The Duracell CopperTop 6 V Alkaline lantern battery is designed for advanced performance in household items like lanterns, electric torches, and more. Duracell alkaline batteries are designed and developed for long lasting performance. Duracell 6V Alkaline batteries are guaranteed for 5 years in storage. Guaranteed for 10 years in Storage: Duracell D alkaline batteries are guaranteed for 10 years in storage.. #1 Trusted Battery Brand: Duracell CopperTop batteries are available in Double A (AA), Triple A (AAA), C, D and 9V sizes. Pack of 1