The XTAR VC2 charger is a lithium-ion battery charger, featuring an tachometer-style LCD display screen to display the charge status of your battery. The VC2 will display the batteries mAh capacity, assuming it is completely drained before charging. The VCw can intelligently identify input power and automatically adjust the the most suitable charge current (0.15A-0.5). It is compatible with a range of IMR lithium vape batteries including 18650 sizes and 26650. Both channels are independent and it can also tell you if you have bad batteries. The VC2 features overcharge protection, over-discharge, short-circuit, and reverse polarity protection.