Chargers
Efest SLIM K4 4 Channel Battery Charger
Description
Efest SLIM K4 Type-C USB LED Battery Charger
Charge your rechargeable batteries faster and smarter with the Efest SLIM K4 Type-C USB Battery Charger. Designed for modern convenience, this intelligent 4-bay charger features a USB Type-C power input, automatic charging current adjustment, and advanced safety protections to provide dependable charging for a wide variety of lithium-ion batteries.
Whether you're charging 18650, 20700, 21700, or other compatible battery sizes, the SLIM K4 delivers efficient performance in a compact, travel-friendly design backed by a three-year manufacturer warranty.
Note: Batteries are not included.
Intelligent 4-Bay Charging
The Efest SLIM K4 independently monitors each charging slot, automatically selecting the appropriate charging current based on the number and type of batteries installed.
Automatic Charging Modes:
- 1 × Battery: 1.0A
- 2 × Batteries: 2 × 1.0A
- 3 × Batteries: 3 × 0.5A
- 4 × Batteries: 4 × 0.5A
This intelligent charging system helps maximize battery performance while promoting long battery life.
Modern USB Type-C Power Input
Unlike traditional chargers, the SLIM K4 features a USB Type-C input, providing fast, reliable, and convenient power delivery.
USB-C Benefits:
- Faster Charging Performance
- Stable Power Delivery
- Convenient USB Compatibility
- Ideal for Home or Travel
Power the charger using compatible USB power adapters or other approved USB power sources.
Easy-to-Read LED Indicators
Built-in LED lights provide real-time charging updates, making battery management simple and convenient.
LED Features:
- Charging Status Indicators
- Easy Battery Monitoring
- Automatic Charge Completion Display
Know exactly when your batteries are fully charged at a glance.
Advanced Safety Protection
The SLIM K4 is equipped with intelligent safety systems designed to protect both your batteries and charger during every charging cycle.
Safety Features:
- Reverse Polarity Protection
- Automatic Charge Completion
- Overcharge Prevention
- Intelligent Battery Monitoring
These protections help promote safe charging while extending battery lifespan.
Broad Battery Compatibility
The Efest SLIM K4 supports many of today's most commonly used rechargeable lithium-ion battery sizes.
Compatible Battery Sizes:
- 10440
- 14500
- 16340
- 17340
- 18350
- 18490
- 18500
- 18650
- 20700
- 21700
- 26500
- 26650
Compatible with 3.6V and 3.7V lithium-ion batteries.
Technical Specifications
-
Input:
- AC 100–240V, 50/60Hz
- DC 5V / 2A
- Output Voltage: 4.2V ±0.05V
- Battery Cut-Off Voltage: 4.20V ±0.05V
- Auto Recharge Voltage: 4.10V ±0.10V
- USB Type-C Power Input
- Four Independent Charging Bays
Compact & Travel-Friendly
The slim, lightweight design makes the SLIM K4 easy to carry while providing dependable charging performance at home, in the office, or on the go.
Why You'll Love It:
- Compact Design
- USB Type-C Convenience
- Intelligent Charging
- Easy LED Monitoring
- Reliable Everyday Performance
What's Included
- 1 × Efest SLIM K4 LED Battery Charger
- 1 × USB Cable
- 1 × User Manual
- 1 × Warranty Card
- 1 × Scratch-Off Validation Serial Number
Battery Safety Guidelines
For safe charging and maximum battery life:
- Never charge damaged batteries.
- Inspect battery wraps before every charge.
- Do not overcharge or over-discharge rechargeable batteries.
- Always charge batteries on a clean, fire-resistant surface.
- Never leave charging batteries unattended.
- Store and transport batteries in protective, non-conductive battery cases.
- Dispose of batteries according to local recycling regulations.
Why Choose the Efest SLIM K4?
- Intelligent 4-Bay Charging
- USB Type-C Power Input
- Automatic Charging Current Selection
- LED Charging Indicators
- Reverse Polarity Protection
- Automatic Charge Completion
- Supports 18650, 20700 & 21700 Batteries
- Compact, Travel-Friendly Design
- Three-Year Manufacturer Warranty
The Efest SLIM K4 Type-C USB Battery Charger offers a modern, efficient charging solution for rechargeable lithium-ion batteries. With intelligent charging technology, broad battery compatibility, advanced safety protections, and convenient USB-C connectivity, it's an excellent choice for users seeking dependable everyday battery charging.
