The XTAR VC2SL charger is a two-bay fast lithium-ion battery charger, featuring an upgraded LCD colour display screen to display the recharge status of your battery. With a press of a button, the XTAR VC2SL will switch the digital and simulated analogue readouts between real-time current, internal resistance and capacity of the battery cells on charge. Compatible with a range of IMR lithium vape batteries including 18650 sizes, 26650 & protected 21700. Both channels are independent and they can also tell you if you have bad batteries. The VC2SL features overcharge protection, over-discharge, short-circuit, and reverse polarity protection.