Duracell Specialty alkaline N batteries - up to 40% more power (vs. IEC portable light test minimum average duration for LR1 size. Results may vary by device and usage patterns) for your devices. Duracell Specialty batteries have up to 5 years of in-storage guarantee so you can be confident these alkaline batteries will be ready when you need them. They are suitable for use in flashlights, calculators and bike lights among other applications.