For a safe, long-lasting battery that just keeps performing, you cannot do better than Duracell Plus. The new and improved Duracell Plus C are alkaline batteries with 100% Life Guaranteed* (*Commercial guarantee vs. the Minimum Average Duration across 2015 IEC C-size battery tests). Ideal for reliably powering your electronic devices. Ideal for powering everyday devices, such as toys, flashlights, radios, etc. Unused batteries last up to 10 years in ambient storage. 98% of our paper-based packs are made from recycled materials.