Kastar AA 2700mAh 2PCS(1-PACK) Rechargeable Ni-MH Batteries Kastar AA 2700mAh , Ni-MH pre-charged rechargeable battery Recharge up to 1000 times, Maintain up to 80% of their charge after 1 year (when not it use) Work in extreme temperatures down to -4F No memory effect - batteries can be recharged when fully, or partially drained The Battery Include 30-DAY Money Back and 3-YEAR Manufacturer Warranty.