Oasis Select
10Pcs 18650 Li-Ion Battery Protection Board 3.7V 28×3mm
10Pcs 18650 Li-Ion Battery Protection Board 3.7V 28×3mm
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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
| Dimensions | 28 × 3mm (approx.) |
| Compatible Battery | 3.7V 18650 Li-Ion |
| Overcharge Release Voltage | 4.275 ± 0.025V |
| Overcharging Voltage Range | 4.075 ± 0.025V |
| Over-Discharge Voltage Range | 2.5 ± 0.1V |
| Overcurrent Detection | 2.8 ± 0.3A |
| Material | Carbide PCB |
| Package Quantity | 10 × Protection Boards |
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.
