Efest Efest Slim K1 Charger

Efest Slim K1 1-Bay USB Charger (For 18650, 20700, 21700 & More)
Charge your lithium-ion batteries safely and on the go with the Efest Slim K1. This compact single-bay charger offers smart charging at 1A, USB-powered convenience, and compatibility with a wide range of Li-ion sizes including 18650, 20700, and 21700 cells.

An intelligent chip automatically detects battery type and adjusts charging for performance and safety. Built-in protections guard against overcharging, short circuits, reverse polarity, and overheating. A clear LED light indicates charge status at a glance.

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
• 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, auto cutoff, reverse polarity
• Dimensions: 110 x 30 x 30 mm
• Includes USB cable

Perfect for vapers, flashlight users, and anyone needing reliable single-cell charging. Keep a spare on hand for safe battery care wherever you go.