3.7V 4000mah Rechargeable Li-ion Battery Pack 3.7V 18650 battery 18650 3.7V 4000mah Rechargeable Li-ion Battery Pack 3.7V 18650 battery Brand New and High quality. 18650 protected rechargeable li-ion lithium battery. Suitable for laser pointer, flashlight torch and other electronics products. Safe and environmental friendly. Over charge and discharge protection. Rechargeable Times: Up to 500 ...