The Efest Slim K1 Battery Charger is a compact and efficient single-bay USB charger designed for lithium-ion batteries.
It provides fast and stable charging at 1A while ensuring safety with multiple protection features.
Equipped with intelligent detection, it automatically adjusts charging functions and safeguards against overcharging, short circuits, and reverse polarity.
Ideal for users seeking a portable and reliable charging solution.
Main Features
Single-bay compact USB charger
Fast charging mode at 1A
LED charging status indicator
Reverse polarity, overcharge, and short-circuit protection
Auto-detect and low voltage activation functions
Smooth sliding spring tested for 15,000+ uses
Chromium-plated steel cathode for precise voltage and low resistance
Compatible with a wide range of lithium-ion battery sizes
Specifications
Input: DC 5V / 1A
Standby Current: <20mA
Activation Current: 50mA – 100mA
Charging Current: 1.0A ±10%
Auto Recharge Voltage: 4.10V ±0.10V
Cutoff Voltage: 4.20V ±0.05V
CV Cutoff Current: <100mA
Operating Temperature: 0°C – 40°C
Compatible Batteries: 3.6V/3.7V Li-ion (10440–26650, including 18650, 20700, 21700, 26650)
