Duracell Plus C batteries are alkaline batteries ideal for powering all your devices. Duracell Plus C has up to 100% extra life* (*Commercial guarantee vs. the Minimum Average Duration across 2015 IEC C-size battery tests. Results may vary by device or usage pattern (IEC's website)). Unused Duracell batteries stay powered up to 10 years in ambient storage. These batteries are Duracell's recommendation for the regularly used devices such as motorized toys, flashlights, digital audio devices and any other. SAFETY : Superior Nylon top closure helps preventing our batteries from leakage. DURABILITY: Duracell technology keeps the energy of your unused batteries for up to 10 years in their packaging (ambient storage).