The Efest LUC V2, 2 bay smart battery charger with LCD screen, displays both voltage and battery capacity. Each charging bay has its own charging status display. Adjusts automatically to the discharge current of different battery sizes. 4 point protection system against over voltage, short-circuit, over-discharging, and reverse polarity protection. Auto stop when battery capacity hits full. 12-24V DC wide voltage charging Mode. Can handle most vape batteries: 3.7V Li-ion/ LiMn batteries, such as 10440, 14500, 14650, 18500, 17670, 18650, 18700, 26500, 26650. Using spacers for charging, charging is capable with 15270 or 14250 batteries.