Etekcity UltraFire 3000mAh 3.7V Rechargeable Li-Ion Battery + Charger Combo Etekcity Ultrafire Li-Ion Rechargeable 18650 with IC Protection (pair) Charges 1 or 2 batteries simultaneously Can be charged over 500 times Holds 85% charge over 12month period Travel charger folds up for easy transport