The XTAR Mini Charger from SeaLife is designed to charge 18650 batteries. Its lightweight and compact design makes it easy to throw in a gear bag or case, and the charger is powered via USB wall chargers and works worldwide. While charging, it features 4.2V automatic cut-off voltage, so you can leave the batteries in the charger for extended periods of time or overnight without damaging them. Additionally, the charger has reverse polarity and short circuit protection for another layer of protection to ensure the safety and longevity of the 18650 cells. A drawstring pouch is included to store and protect the mini charger when not in use.