Efest Slim K4 USB-C Battery Charger

Upgrade your battery charging setup with the Efest Slim K4 USB-C Battery Charger, a compact and portable 4-slot charger designed for rapid and safe power-ups. Featuring intelligent charging technology, this charger automatically detects battery type and adjusts the current for optimal performance. Equipped with LED indicators, you can easily monitor charging status for each battery independently. Compatible with lithium-ion IMR batteries ranging from 10440 to 26650, including 18650, 20700, and 21700 cells, the Slim K4 ensures versatile usage for vaping devices, flashlights, and other electronics. Built from ABS fireproof materials and incorporating six layers of protection—including short-circuit protection, overcharge protection, reverse polarity protection, and 0V activation recovery—this charger combines safety, convenience, and reliability in a sleek, lightweight design. Perfect for home use or travel, the Efest Slim K4 Charger keeps your batteries ready when you need them.

• 4 Independent Charging Slots – Charge up to four batteries simultaneously

• USB-C Input (5V 2A) – Fast and efficient power source

• Intelligent Auto-Detect Charging – Adjusts current for optimal performance

• LED Indicators – Monitor each battery’s charging status easily

• Wide Battery Compatibility – Supports 10440 to 26650 lithium-ion batteries

• Six Layers of Safety Protection – Includes overcharge, short-circuit, over-discharge, reverse polarity, and 0V activation recovery

• Lightweight & Portable Design – Ideal for home or on-the-go use

• Efest Slim K4 USB-C Battery Charger | Slim K4 USB-C

Charge your batteries safely and efficiently with the Efest Slim K4 USB-C Battery Charger. Features 4 independent slots, intelligent auto-detect charging, LED indicators, and wide compatibility with lithium-ion batteries from 10440 to 26650. Perfect for vaping, flashlights, and portable devices.