18650 Li-Ion USB Battery Charger – 2 & 4 Slot Smart Charger

Charge Smarter with the 18650 USB Li-Ion Battery Charger

Keep your rechargeable lithium-ion batteries topped up and ready to go with this compact, intelligent USB battery charger. Available in 2-slot and 4-slot configurations — and in convenient multi-packs of 1, 3, or 5 units — this charger is ideal for households, workshops, and anyone who relies on high-capacity 18650 cells and other popular Li-Ion battery formats.

Key Features

• Wide Compatibility: Works with 10440, 14500, 14650, 16340, 16650, 18350, 18500, and 18650 lithium-ion batteries — one charger for virtually all your Li-Ion needs.
• Independent Charging Slots: Each slot charges independently with zero cross-slot interference, so you can mix battery types or sizes without issue.
• Intelligent Auto-Cutoff: Smart circuitry monitors charge level and automatically stops at 4.23V to prevent overcharging and protect battery longevity.
• Two-Color Indicator Lights: Glowing red during charging, switching to green when fully charged — no guessing, no hassle.
• Universal USB Power Input: Connects via USB with a voltage range of 5–20V DC, compatible with most USB adapters, power banks, and laptop ports.
• AC Input: AC 110–240V, 50/60Hz — suitable for use in virtually any country.
• Output: DC 4.2V at 600mA per slot — steady, reliable charging without rushing.
• Portable & Compact: Lightweight design makes it easy to toss in a bag, keep at a desk, or pack for travel.
• Multi-Pack Options: Available in 1, 3, or 5-piece sets — stock up and save.

Specifications

• Slot Options: 2-slot or 4-slot
• Input Voltage: AC 110–240V, 50/60Hz
• USB Input Range: 5–20V DC
• Output Voltage: DC 4.2V, 600mA per slot
• Charge Cutoff Voltage: 4.23V
• Indicator: Red (charging) / Green (full)
• Compatible Batteries: 10440, 14500, 14650, 16340, 16650, 18350, 18500, 18650
• Battery Included: No
• Made in China

What's in the Box?

Your selected quantity of USB Li-Ion battery chargers (batteries not included).

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For more information on safe battery charging practices, visit the U.S. Consumer Product Safety Commission (CPSC) Lithium Battery Safety Guide.

Frequently Asked Questions

Q: What battery sizes is this 18650 charger compatible with?

A: This smart Li-Ion charger is compatible with a wide range of cylindrical lithium-ion batteries including 10440, 14500, 14650, 16340, 16650, 18350, 18500, and 18650 formats — making it one of the most versatile options available.

Q: Can I charge different battery sizes at the same time in the same charger?

A: Yes! Each slot operates independently with no cross-slot interference, so you can safely charge different battery sizes or capacities simultaneously without any issues.

Q: Will this charger overcharge my batteries?

A: No. The built-in intelligent auto-cutoff function stops charging automatically once the battery reaches 4.23V, protecting your batteries from overcharging and extending their overall lifespan.

Q: Do batteries come included with the charger?

A: Batteries are not included. This listing is for the charger unit(s) only. You will need to supply your own compatible Li-Ion batteries.

Q: Is this charger suitable for international use?

A: Yes. The AC input supports 110–240V at 50/60Hz, making it compatible with power outlets in most countries around the world.