The new generation of O2 has arrived in the form of the Golisi S2 Charger. It adopts an upgraded micro-processor which enables the large LCD screen to show the charging information clearly: output current, charging state, battery charging time and battery type. It can also display battery voltage and capacity information by clicking the side button. S2 Charger is compatible with not just 20700, 26650, 18650 Li-ion batteries and most cylinder shaped rechargeable batteries, such as Ni-mh, Ni-cd. Meanwhile, S2 supports 3 current output options to meet your different needs (0.5A/1.0A/2.0A). It can be used as a power bank with USB cable. Available Plug.