Typical Ni-MH Batteries can lose a charge between 3-6 months, especially when stored in warmer climates. Our batteries are pre-charged from the factory and “Ready to Use” when you need them. They have excellent cycle life, which means each battery can be recharged over 1000 times. Suitable for low to high draining devices. ​ Nominal Voltage: 1.2V ​Capacity: 1000mAh Standard Charge Rate: 260mA ​Fast Rechargeable: Yes