18650 2200mAh 3.7V Li-ion.
A 18650 battery is a lithium-ion battery. The name derives from the battery's specific measurements: 18mm x 65mm. For scale, that's larger than an AA battery. The 18650 battery has a voltage of 3.7v and has between 2100mAh and 2200mAh.
18650 Li-on battery industrial rechargeable - 2200mAh spec
Size:65mm x 18.25mm