Efest Slim K2 Charger

Efest Slim K2 – 2-Bay USB Lithium Battery Charger
The Efest Slim K2 is a dual-bay, compact USB battery charger built for safe, efficient, and reliable charging of your lithium-ion batteries. With a constant 1A output per bay, the Slim K2 intelligently auto-detects battery status and begins charging immediately with safety as a top priority.

Compatible with a wide range of cylindrical 3.6V/3.7V Li-ion batteries from 10440 to 26650 (including 18650, 20700, 21700), this versatile charger features reverse polarity protection, short circuit protection, low voltage activation, and overcharge prevention.

Its slim, travel-friendly design and USB power make it an ideal everyday charger for vapers, flashlight enthusiasts, and tech users. The high-tensile piano wire springs and chromium-plated steel contacts ensure a smooth experience and precise voltage regulation over thousands of cycles.

Battery Safety Warning:
Only use this charger with rechargeable lithium-ion batteries. Never attempt to charge non-rechargeable or damaged batteries. Always charge in a fire-safe area, never leave batteries charging unattended, and follow all lithium battery safety practices. Misuse may result in fire, injury, or property damage. Buyer assumes all responsibility for safe use.

Specs & Features:

• Input: DC 5V / 1A (USB)
• Charging Current: 1A x 2 (each slot charges independently)
• Supported Chemistries: 3.6V / 3.7V Li-ion (IMR, INR, ICR)
• Compatible Battery Sizes: 10440, 14500, 16340, 17340, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22650, 26500, 26650
• Safety Protections: Overcharge, short circuit, reverse polarity, auto cutoff
• Dimensions: 122 mm x 30 mm x 32 mm
• Includes: USB cable

Package Includes:

• 1 x Efest Slim K2 Battery Charger
• 1 x USB Cable
• 1 x User Manual