High-Capacity TYPE-C Duplex 21700 Li-ion Battery Rechargeable USB-C Lithium Cell for Flashlight Outdoor & Portable Devices

The TYPE-C Duplex 21700 Li-ion battery is a high-capacity rechargeable battery with a built-in USB Type-C duplex port, enabling both charging and discharging without the need for an external charger. Designed in the 21700 cylindrical format, it combines compact size, strong output power, and convenient plug-and-play operation. This smart battery solution is ideal for modern portable electronics, outdoor gear, and emergency backup power.

1. Dual Function Port – Type-C duplex interface for both charging and discharging.
2. High Energy Density – Longer runtime compared to 18650 batteries.
3. Convenient Charging – Direct USB-C input eliminates special chargers.
4. Durable Performance – Long cycle life with stable voltage output.
5. Portable & Versatile – Compact design fits a wide range of devices.

• Flashlights and headlamps
• Outdoor camping equipment
• Power banks and mini fans
• Wireless microphones and speakers
• Emergency backup power for electronics

• OEM/ODM Customization – Capacity, voltage, and branding available.
• Engineering Expertise – 13+ years of battery R&D and production.
• 24/7 Technical Support – Professional after-sales service worldwide.
• Fast Delivery – Local warehouses and flexible shipping solutions.
• Strict Quality Control – Every unit tested before shipment.

• Packaging Options: Standard paper cartons or reinforced wooden boxes.
• Shipping Methods: Sea freight, air freight, or express delivery.
• Custom Packaging: Available upon request for branding or retail display.

Q1: Can I charge the battery with a normal USB-C cable?

Yes, it supports standard USB-C cables for charging.

Q2: Does it need a special charger?

No, the duplex Type-C port allows direct charging without an external charger.

Q3: What is the typical cycle life?

Over 500+ cycles with proper use.

Q4: Can it be customized with my logo?

Yes, Yunfan Factory provides OEM logo and capacity customization.

Q5: Is it safe for international shipping?

Yes, it complies with UN38.3 and MSDS standards for safe transport.