EFEST Slim K4 Battery Charger

The EFEST Slim K4 Battery Charger is a portable battery charger designed to charge up to four lithium-ion batteries simultaneously. It is compatible with a wide range of battery sizes, including 18650, 26650, and 20700 batteries, which are commonly used in electronic cigarettes. 

The charger has an LED indicator light that displays the charging status of each battery. The light will turn red when the battery is charging and turn green when the battery is fully charged.

The EFEST Slim K4 Battery Charger is designed with multiple safety features, including over-discharge protection, over-voltage protection, and short-circuit protection. These safety features help to prevent damage to the battery or the charger and ensure safe and reliable charging.