Efest

Efest Slim K4 4-Slot Fast Charging Vape Battery Charger

AED 90

A 4-slot universal battery charger with USB-C fast charging, auto-adjusting current, and multiple safety protections. Compatible with 18650, 20700, 21700, and 26650 batteries for everyday vaping.

✅ 100% Genuine
🚚 Express Delivery in Dubai, Sharjah & Ajman
💵 Cash on Delivery

The Efest Slim K4 is a compact four-slot charger built for vapers who run external batteries in mod setups. It handles multiple lithium-ion sizes at once and automatically adjusts output current depending on how many batteries are loaded, so charging stays balanced whether you are topping up one battery or four.

Safety is built into every slot: the K4 cuts off automatically once a battery reaches 4.2V, and its protection system guards against overcharging, short circuits, and reverse polarity. Spring-loaded slots and fire-retardant housing make it a dependable option for daily use or travel, and its compact footprint means it takes up little space on a desk, in a drawer, or packed in a travel bag.

Key Features

4-slot universal battery charger with independent slot monitoring
USB Type-C fast charging input
Auto-adjusting current: 2A, 1A, or 0.5A depending on slots used
Auto cut-off at 4.2V to prevent overcharging
Overcharge, short circuit, and reverse polarity protection
LED indicators show charging and full status per slot
Compatible with 18650, 20700, 21700, and 26650 batteries

Specifications

Attribute	Detail
Slots	4
Charging input	USB Type-C
Output current	2A / 1A / 0.5A (auto-adjusting)
Cut-off voltage	4.2V
Compatible batteries	18650, 20700, 21700, 26650 and other Li-ion sizes
Box contents	Charger, USB-C cable, manual, warranty card

Delivery Across Dubai & UAE

Every Efest Slim K4 sold through Vape Dubai King is genuine stock, dispatched same-day within Dubai and delivered nationwide across the UAE on a cash-on-delivery basis.

Frequently Asked Questions

Can the Efest Slim K4 charge 21700 batteries?

Yes, it supports 21700 batteries alongside 18650, 20700, and 26650 sizes, making it suitable for most external-battery vape mods.

How fast does each slot charge?

Output is shared automatically: two batteries draw up to 1A per slot, while four batteries draw around 0.5A per slot for balanced, safe charging.

Does the charger stop automatically when a battery is full?

Yes, it cuts off charging once a battery hits 4.2V, preventing overcharging and helping protect long-term battery health.

What comes in the box?

Each Efest Slim K4 ships with the charger unit, a USB Type-C cable, a printed user manual, and a warranty card, so it is ready to use as soon as it arrives.