The product is new. This is the price for two batteries. It has a built-in protection circuit. Dimensions: 69mm (length) x 18.2mm (outer diameter) Nominal voltage: 3.7V, Nominal value: 2600mAh This product complies with the Electrical Appliance and Material Safety Law enforced by the Ministry of Economy, Trade and Industry. We also conduct all-item inspections. It is marked with the PSE mark. (Products listed without the PSE mark are illegal. Please be careful as they are dangerous.) - The maximum capacity of 18650 lithium-ion batteries is 3500mAh. 18650 rechargeable batteries sold with a higher capacity may have a different actual capacity. If the capacity is low, the lighting time will be shorter. Please be careful. - 18650 2600mAh with a protection circuit. It prevents over-discharge and overcharge. You can use it safely and with peace of mind because it has a protection circuit. As a result of measuring 18650 batteries sold elsewhere, the capacity was not as stated. If the capacity is low, the lighting time will be shorter. <Options> If you want to change or add batteries, please comment before purchasing. After the price is changed, you can proceed with the purchase. - Change to 3000mAh battery +260 yen - Change to 3400mAh battery +980 yen By changing the battery capacity, the lighting time of the light will be longer in proportion to the capacity. - We also sell a rapid charger that charges rechargeable batteries via USB. Built-in overcharge protection circuit (safe and secure) (If you charge a lithium-ion rechargeable battery with a charger that does not have an overcharge protection circuit, there is a risk of explosion. Please be careful.) Size: Total length 105mm x width 50mm x height 28mm, weight approx. 73g Input: 5V 1A Output: 4.2V 1A Input terminal: USB port USB-microUSB cable: 80cm +380 yen. D2648