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.