Package: 4 pack 10,000mAh high capacity D cell rechargeable batteries Can be charged up to 1200 times Maintains 80% of original charge after being stored for 3 years of non-use, it’s highly recommended to be fully charged every 3 months Ni-MH batteries without memory effect which makes it convenient to operate Ideal for any devices need D cell batteries and can be charged by a universal charger that support NiMH D rechargeable batteries