Panasonic envelope rechargeable batteries 4 pack

The batteries are able to have prolonged life with a durable conductive surface layer of the active (positive) electrode material (made primarily from nickel-metal hydride) for durability and greater conductivity. Limiting the degradation of the conductive layer increases the number of times that the batteries can recharged, in this case up to 2100 times. They are ready to use out of the package as they are precharged at the factory upon manufacturing using power generated from solar energy. In areas with very low temperatures, these batteries can funtion well down up to temperatures of -4 degrees Fahrenheit.