18650 Lithium Battery Charger – 1/2/3 Slot USB 4.2V

Keep your rechargeable lithium batteries topped up and ready to go with this compact, multi-slot USB charger from Fanmuran. Whether you need a single-slot charger for occasional use or a 3-slot model to charge multiple batteries simultaneously, this intelligent charger has you covered.

Why Choose This Battery Charger?

• Wide Compatibility: Works with a broad range of cylindrical lithium batteries — 18650, 17670, 14500, 10440, 16340, 16650, 14650, 18350, and 18500. One charger for nearly all your devices.
• Auto-Stop Smart IC: Built-in intelligent IC automatically stops charging once batteries reach full capacity, preventing overcharging and extending battery lifespan.
• Built-In Safety Protections: Features output short-circuit protection and anti-reverse-connection design so accidental battery insertion won't cause damage.
• Flame-Retardant Housing: The shell is crafted from high-quality, flame-retardant, heat-resistant material — minimizing the risk of heat-related issues during charging.
• USB Powered: Powered via standard USB (DC 5V / 1A–2A), so you can charge from any USB wall adapter, power bank, or laptop port you already own.

Technical Specifications

What's in the Box?

• 1× Battery Charger (select 1, 2, or 3-slot configuration)

Note: Colors may vary slightly from photos due to monitor calibration. Please allow ±1–2mm in measurements due to manual measuring. Packed securely in a bubble bag — no retail box included.

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For general guidance on safe battery and charger use, refer to the U.S. Consumer Product Safety Commission – Lithium-Ion Battery Safety.

Learn more: Battery charger

Frequently Asked Questions

Q: What battery sizes are compatible with this lithium battery charger?

A: This charger is compatible with a wide range of cylindrical lithium batteries including 18650, 17670, 14500, 10440, 16340, 16650, 14650, 18350, and 18500. It's a versatile solution for flashlights, vaporizers, power tools, and other devices that use rechargeable lithium cells.

Q: How does the charger know when to stop charging?

A: The charger uses a built-in intelligent IC (integrated circuit) that monitors the battery's charge level and automatically cuts off power once the battery reaches 4.2V (full charge). This helps prevent overcharging and protects both your batteries and the charger.

Q: What do I need to power this charger?

A: This charger connects via USB and requires a DC 5V / 1A–2A power source. Any standard USB wall adapter, USB port on a laptop, or power bank will work — no proprietary power supply needed.

Q: Is it safe to leave batteries in the charger overnight?

A: The auto-stop feature does cut charging once the battery is full, reducing overcharge risk. However, as a general best practice, it is advisable not to leave any battery charger unattended for extended periods. Always follow standard lithium battery safety guidelines.