XTAR VC2 Charger -Can detect real capacity of your batteries -Creative LCD screen displays charging current, battery voltage and charging capacity -Intelligently identify input power and automatically adjust suitable charging current from 0.15A to 0.5A to protect your charging device -Three stages of charging (TC-CC-CV) can prolong the lifespan of your batteries -Automatically stop charging when complete and restart charging function, so you can keep the batteries inside the charger overnight -5V USB voltage, within the safety voltage ensures your safety -Intelligently identify bad/ Ni-MH batteries by showing "Null", and identify short circuit and mis-insertion by showing "Err" -Compatible with 10440/14500/14650/16340/17500/17670/18350/18490/18500/18650/ 18700/22650/25500/26650 3.6V/3.7V Li-ion batteries and IMR batteries -Two independent slots, one VC2 equal to two separate chargers -Compatible with any USB power and wall adaptors. -0V activation function can rescue your over-discharged batteries. Normally you need to throw away those over-discharged batteries, but with XTAR chargers you can rescue them and reuse them -Independent two channels can charge two batteries at the same time -Know how full your batteries are - Each interval of battery voltage is about 10% of the battery capacity and you can clear know when your batteries can be fully charged -Smartly notify you - The light of screen will flash 3 times in every 10 seconds when your batteries are full EdisonBright EBR34 Li-ion rechargeable 18650 battery Battery Type: 18650 Chemistry : Li-ion Voltage : 3.7V Capacity : 3400mAh Charge Current : 1700mA (0.5C) Max Charge Current : 3600mAh (1C) Max discharge current : 4200mA Diameter : 0.7" (18.6mm) Height : 2.7" (69.5mm) nbsp;