A double battery USB powered charger with an automatic CC/CV (constant current and constant voltage) charge profile, the NiteCore UM20 features a pass-through USB detector, allowing you to charge a single battery along with a separate device without moving or unplugging wires. A preference switch makes it possible to prioritise where the charge is going first.
Similar to its bigger brothers the i2 and D4, the UM20 features a spring loaded slider that accommodates batteries of many different sizes, including 18650 and 18350. A digital read out displays battery power levels and the charging process accurate to 1%, and will automatically stop charging upon completion. It also has a built in reverse polarity protection (meaning it won’t break if you put your battery in the wrong way), and adjusts charging power based on detected battery capacity. The UM20 is constructed from fire-retardant materials, and designed for optimal heat dissipation with paramount safety in mind.