CrazyB 3.7V 18650 9000mah Rechargeable Lithium Battery with 18650 battery Charger Yellow (2 PCS Batteries + Charger) Li-Ion Rechargeable 18650 with IC Protection 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