Rechargeable 3 Cell Li-ion battery with 8700mAh capacity, for use with our PDC-WFB2MP wire free IP cameras. Even after one year of non use the batteries will maintain 85% of their full charge. There is also no memory effect so they don't need to be fully discharged before recharging them. Operating temperature is -4°F to 158°F (-20°C to +70°C).