This Rechargeable battery is a 12V 15000mah Li-ion Battery and it is specially designed for powering the system device which use12V DC power. You can use this battery to power our powerful wireless transmitter， CCTV camera and so on. Suitable for your need.Super storage capacity. With working indicator. Specially designed for the system devices which use 12V power. Built-in ON/OFF switch to save power usage. Large mah value means long battery life. Over-charge/discharge protection.Battery Charging MethodOpen the battery switch to the "ON" at the red light on the charger indicates when charging starts (if battery is full charge，the power green light will remain unchanged); charging time is generally more than 8 hours; until the plug's red light becomes green，the battery is fully charged.Notepls trun on the switch when charge for this item.And if you want to measure the voltage，suggest using pointer multimeter.Because digital measure table easily jump table.If the item is not 10.8-12.6V，pls trun on the switch again.We are all tested before delivery.SpecificationSize:150*70*37mm(battery)Color: BlueCapacity: 15000mAh.Battery type: Rechargeable Li-on battery.Input voltage: 12.6VOutput voltage: 10.8-12.6 DCOutput current:1-2.4ALine interface specification 5.5 * 2.1 MMProduct life: circulation charge and discharge more than 500 times Package include1X 12V 15000mah Li-ion Battery1X EU plug