The Efest LUC V6 is a six-bay lithium ion battery charger with adjustable outputs. USB output allows the charger to act as a power bank to charge other USB devices. This charger is compatible with most types of cylindrical lithium batteries ranging in sizCALIFORNIA PROPOSITION 65 - Warning: This product contains nicotine, a chemical known to the state of California to cause birth defects or other reproductive harm. Read our terms and conditions page before purchasing our products. USE ALL PRODUCTS ON THIS SITE AT YOUR OWN RISK!