10Pcs 18650 Li-Ion Battery Protection Board 3.7V 28×3mm

10-Pack 18650 Li-Ion Battery Protection Boards – 3.7V, 28×3mm

Keep your 3.7V 18650 lithium-ion batteries safe and performing at their best with this set of 10 precision protection circuit boards. Each board is engineered with a high-quality integrated circuit to guard against overcharging, over-discharging, short circuits, and overcurrent — giving you peace of mind whether you're building DIY electronics, battery packs, or repair projects.

Key Features

• 4-in-1 Protection: Overcharge, over-discharge, short circuit, and overcurrent protection in a single compact board.
• Precision IC: Main IC uses imported precision components for stable, reliable performance.
• Low Current Consumption: Minimal standby draw ensures your battery retains its charge when not in use.
• Compact Design: Ultra-slim 28×3mm profile fits neatly inside 18650 battery housings.
• Solderable Tabs: Pre-fitted solder tabs make installation straightforward for DIY enthusiasts and technicians alike.
• Durable Build: Fine workmanship ensures consistent performance and long service life.
• Versatile Compatibility: Suitable for a wide range of 3.7V lithium-ion battery configurations and high-integration, low-cost applications.

Specifications

Connection Guide

• B+ → Connect to Battery Positive (+)
• B− → Connect to Battery Negative (−)
• P+ → Battery Output / Input Positive (+)
• P− → Battery Output / Input Negative (−)

Package Contents

• 10 × 18650 Li-Ion Battery Protection Boards

Made in Mainland China.

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For more information on lithium battery safety standards, visit the U.S. Consumer Product Safety Commission (CPSC) – Lithium Battery Safety.

Notes

• Actual color may vary slightly from images due to monitor brightness and lighting conditions.
• Please allow a slight manual measurement deviation of ±1–2mm.

Learn more: Battery management system

Frequently Asked Questions

Q: Are these 18650 battery protection boards compatible with all 3.7V lithium-ion batteries?

A: These protection boards are designed primarily for 3.7V 18650 Li-Ion cells. They are also compatible with many other similarly rated lithium-ion battery types and configurations, making them a versatile choice for a wide range of DIY and repair projects.

Q: What protections do these boards provide for my 18650 battery?

A: Each board offers four key protections: overcharge protection (cuts off at 4.275V), over-discharge protection (cuts off at 2.5V), overcurrent protection (triggers at approximately 2.8A), and short circuit protection — all essential for maximizing battery safety and longevity.

Q: Do I need to solder these protection boards onto my battery?

A: Yes. These boards come with solder tabs for secure connection to your 18650 cell. Standard soldering equipment and basic electronics knowledge are recommended for proper installation. Connect B+ to battery positive, B− to battery negative, P+ to output positive, and P− to output negative.

Q: Why do I get 10 pieces in one order?

A: This listing includes 10 protection boards per pack, offering excellent value for hobbyists, electronics repair professionals, and makers who need multiple boards for battery pack builds or spare replacements.