60V 20V BMS Lithium Battery Protection Board 18650 21700

60V / 20V BMS Lithium Battery Protection Circuit Board – Compatible with 18650 & 21700 Cells

This BMS (Battery Management System) protection circuit board is designed for experienced users who rebuild or assemble lithium battery packs. Compatible with 20V and FlexVolt 60V lithium battery configurations, this board supports 18650 and 21700 cylindrical cells, providing essential charge/discharge protection for your DIY battery pack projects.

Please note: This listing is for the BMS protection board (shell/housing + circuit board) only. No battery cells are included. This product is intended exclusively for individuals with practical experience in battery assembly and a solid understanding of lithium battery performance and safety.

Key Features

• Wide Voltage Compatibility: Supports 20V and 60V FlexVolt lithium battery configurations
• Cell Compatibility: Works with 18650 and 21700 lithium battery cells
• Overcharge & Over-discharge Protection: Safeguards battery cells during charging and discharging cycles
• PCB + Plastic Construction: Durable materials built for reliable assembly
• Repair & Rebuild Ready: Ideal for battery pack repair, upgrade, or custom assembly projects

Specifications

• Voltage Range: USB (5–20V DC) / 60V FlexVolt compatible
• Compatible Cells: 18650, 21700 Lithium
• Material: PCB + Plastic
• Battery Included: No
• Country of Origin: Made in Mainland China

Assembly & Safety Precautions

This product is intended for technically experienced users only. Please read all precautions carefully before assembly:

1. Wiring: When welding battery leads and sampling points, verify polarity carefully. Incorrect connections may damage the circuit board and require retesting before use.
2. Cell Isolation: Do not allow the BMS board to directly contact battery cell surfaces during assembly. Ensure all connections are firm and secure.
3. Grounding: All welding/soldering equipment must be reliably grounded. Take proper electrostatic discharge (ESD) precautions to prevent board damage from static electricity or electrical leakage.
4. Component Safety: Avoid touching any components on the circuit board with lead wires or a soldering iron during assembly — contact may burn out the board.
5. Environmental Protection: Maintain anti-static, moisture-proof, and waterproof conditions during use and storage.
6. Initial Power-On: If there is no voltage output on first power-on after assembly, activate the pack using a dedicated compatible charger.

Package Contents

• 1 × BMS Lithium Battery Protection Circuit Board Set

Note: Product color may vary slightly from images due to monitor brightness and lighting conditions. Please refer to the actual product received.

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Learn more: EPA guidance on lithium-ion battery handling

Frequently Asked Questions

Q: Is this BMS protection board compatible with both 18650 and 21700 lithium battery cells?

A: Yes, this BMS circuit board is compatible with both 18650 and 21700 cylindrical lithium battery cells, making it versatile for a range of DIY battery pack assembly and repair projects.

Q: Are battery cells included with this protection circuit board?

A: No, battery cells are not included. This listing is for the BMS protection circuit board (shell + PCB) only. You will need to source compatible 18650 or 21700 lithium cells separately.

Q: Who should use this BMS battery protection board?

A: This product is designed strictly for individuals who have hands-on experience with lithium battery assembly and a thorough understanding of battery safety. It is not recommended for beginners or those unfamiliar with lithium battery systems.

Q: What should I do if there is no voltage output after the initial assembly?

A: If the assembled battery pack shows no voltage output on the first power-on, use a dedicated compatible charger to activate the pack. This is a normal part of the initial activation process for some BMS configurations.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.