Li-Polymer Battery 12V 3000mAh with Dc Jack connector

From the shop's description

Capacity: 3000 mAh Voltage: 12 V 2x Connector : 2.1mm x 5.5mm (ID x OD), cylindrical barrel receptacle (male center pin) Size: 97 x 42 x 17 mm (L x W x H) Note: Use a balance charger designed for lithium polymer chemistry Specifications Output Voltage 12 VDC Capacity 3000 mAH Chemistry Lithium Polymer Rechargeable Yes