Duracell Specialty Alkaline batteries have a 5-year guarantee in storage, so you can be confident these batteries will be ready when you need them. They offer long-lasting power for your specialty devices.Duracell 21/23 Batteries: The Duracell Coppertop 12 Volt alkaline battery is designed for use in household items like car alarms, key fobs, GPS trackers, remote controllers and more.Duracell guarantees these batteries against defects in material and workmanship. Should any device be damaged due to a battery defect, they will repair or replace it at their option. Long Lasting Power: Duracell Specialty Alkaline batteries are designed and developed for long lasting quality performance. Guaranteed for 5 years in Storage: Duracell 21/23 Specialty Alkaline batteries provide durable value are guaranteed for 5 years in storage.