Olight 750mah 14500 3.7v Protected Rechargeable Li-ion Batteries for Olight S15 LED Flashlight LD11 SK68 Q5 J5 Set of 2 Built-in protection circuit, guards against - Over-charge, Over-discharge and Over-current High Performance IC from Japan Improved voltage stability due to low internal resistance Include 2x Olight 750mAh 14500 rechargeable battery