USB Smart Lithium Battery Charger 1/2/4 Slot 18650 21700

USB Smart Lithium Battery Charger – 1, 2 & 4 Slot for 18650, 21700 & More

Keep your rechargeable batteries topped up and ready to go with this compact, smart USB lithium battery charger. Compatible with a wide range of cylindrical battery formats — including 18650, 21700, 10400, 14500, 16340, 16650, and 14650 — this versatile charger is an essential addition to any home, workshop, or travel kit.

Designed for everyday convenience, it connects to any standard USB power source, including mobile phone chargers and power banks, so you're never far from a full charge. The intelligent charging circuit manages low-voltage input for safe, efficient charging every time. Available in your choice of 3 colors to match your style.

Key Features

• 1, 2 & 4 Slot Configurations: Choose the slot count that suits your needs — charge one battery or four simultaneously.
• Wide Battery Compatibility: Supports 18650, 21700, 10400, 14500, 16340, 16650, 14650, and more lithium battery types.
• USB Powered: Connects directly to USB power adapters, power banks, laptops, or car USB ports — no proprietary charger required.
• Smart Charging Circuit: Built-in protection monitors the charging process for safe, low-voltage operation.
• Compact & Portable: Lightweight shell design makes it easy to stow in a bag, drawer, or travel kit.
• 3 Color Options: Pick the look that works for you.
• USB Cable Included: Ready to charge right out of the box.

What's in the Box?

• 1 × USB Smart Lithium Battery Charger (1, 2, or 4-slot configuration)
• 1 × USB Charging Cable

Compatible Battery Types

18650 | 21700 | 10400 | 14500 | 16340 | 16650 | 14650 lithium batteries

For guidance on safe rechargeable battery use and handling, visit the U.S. Consumer Product Safety Commission (CPSC) Battery Safety page.

Learn more: Battery charger

Frequently Asked Questions

Q: What battery sizes does this USB smart charger support?

A: This smart lithium battery charger is compatible with a wide range of cylindrical lithium batteries, including 18650, 21700, 10400, 14500, 16340, 16650, and 14650 formats — making it one of the most versatile USB battery chargers available.

Q: What USB power sources can I use with this charger?

A: The charger works with any standard USB power source — including mobile phone wall adapters, power banks, laptop USB ports, and even car USB chargers. No proprietary power supply is needed.

Q: Is this charger safe to leave unattended while charging?

A: The built-in smart charging circuit regulates input voltage and monitors the charging process to help ensure safe operation. As with all battery chargers, it is best practice to charge in a well-ventilated area and check on your batteries periodically.

Q: How many batteries can I charge at once?

A: Depending on the slot configuration you select (1, 2, or 4 slot), you can charge one to four batteries simultaneously, making this charger ideal for households or users with multiple devices powered by lithium batteries.