ON THE WAY&reg;2Pcs 3.7V 14500 1200mAh Rechargable Li-Ion AA Batteries with Charger Combo 1200mAh 14500 Li-ion Rechargeable Battery Lighter than standard alkaline battery No memory effect Can be charged over 500 times.Holds 85% of it's charge over 12month period Warm tips:Before purchase, please make sure the battery voltage corresponds with your device voltage