1This battery box has XP7 waterproof function, durable to use, long serive life. 2Without spot welding batteries, greatly reduced internal resistance of the battery, improved battery discharge performance, effectively improved the battery life. 3Easy to use, it can hold 2pcs 26650 or 2pcs 18650 lipo batteries. 48.4V DC connector input and output voltage. the USB connector has an output voltage of 5V and a current of 2A. 5Support the function of charging the mobile phone, and with power display function. Condition: 100% Brand NewItem Type: Battery BoxMaterial: PlasticColor: As picture shownOvercharge Protection Voltage: 8.4VOver Discharge Protection Voltage: 5VCurrent Over-discharge Protection Voltage: 9VStandby Current: Below 80uAUSB Output Standard Voltage: 5V 0.2USB Maximum Output: 2100mA(The battery needs to be aligned with the positive and negative poles, otherwise it will burn the battery box) (No Battery Included)2 x 26650/2 x 18650 battery box2 interfaces, 8.4v output and input, 5v output, can be put into 18650 as a charger, can be used as a portable battery box, charger, power supply for bicycle lights, USB lights and so on. 1 x Battery Box This product is just a battery box, does not include batteries and chargers.