The Slim K2 Charger by EFest is a dual-slot battery charger with a micro USB port. The charger also has dual LED displays that show the charging status.

Each port is separated and monitored separately, ensuring the most effective charge. The Efest Slim K2 Charger has reverse polarity, short circuit, overcharge, and other safety features.

The Efest Slim K2 Charger is capable of charging a wide range of 3.6V/3.7V lithium batteries often seen in electronic cigarettes.