Duracell offers a wide range of batteries for electronics that require reliable power. Duracell Plus 9 V alkaline batteries are ideal for all your devices. Duracell Plus Alkaline 9V batteries have a 100% guaranteed lifespan* (*Commercial warranty compared to minimum average life in the 2015 IEC 9V battery tests. Results may vary by device (IEC website)). Unused Duracell batteries can be stored for up to 5 years under normal conditions.