1-Slot USB Charger Adapter LED Smart Charger For Rechargeable Li-ion Battery 18650 26650 14500 USB1U Item Name: Battery Charger Material: ABS Input: DC 5V Output: 4.2V/500mA Compatible Batteries: 18650/18500/18350/16650/16340/14650/14500/10440 Features: Fast Charging, Over-charge Protection, LED Indicator Specifications: The battery charger has single-core circuit design for fast charging with USB port. It has protections of overcharge, over-discharge, over-temperature and over-current. Built-in smart chip, when the battery is installed reversely, the charger IC circuit is automatically disconnected and the light is off. It is compatible with a variety of common batteries, like 18650/18500/18350/16650/16340/14650/14500/10440 batteries.