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Dual-slot 1A USB charger for Li-ion batteries: 10440, 14500, 16340, 17500, 17650, 18350, 18490, 18500, 18650, 20700, 21700, 22650, 26500, 26650. Smart, safe, and travel-friendly.
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.
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