Item specifics
Description
2S 7.4V Lithium Battery Protection Board is an essential safety module. The 2S 7.4V Lithium Battery Protection Board integrates four safety mechanisms. For power tools, the 2S 7.4V Lithium Battery Protection Board provides reliable protection. The 2S 7.4V Lithium Battery Protection Board supports 2A to 9A currents. We recommend the 2S 7.4V Lithium Battery Protection Board for 18650 packs. Choosing the 2S 7.4V Lithium Battery Protection Board ensures long battery life.
2S 7.4V Lithium Battery Protection Board Product Overview
The 2S 7.4V Lithium Battery Protection Board is a protection board specifically designed for 2S (two cells) 7.4V lithium battery packs, suitable for 18650 and other rechargeable lithium-ion batteries. The 2S 7.4V Lithium Battery Protection Board integrates four major protection mechanisms including overcharge protection, overdischarge protection, overcurrent protection, and short circuit protection, providing comprehensive safety and reliability for battery packs. The 2S 7.4V Lithium Battery Protection Board is available in six continuous discharge current versions: 2A, 3A, 4.5A, 6A, 7.5A, and 9A, meeting the needs of various power applications. The charging voltage for the 2S 7.4V Lithium Battery Protection Board is 8.4V to 9V, with single-cell static consumption current as low as 3μA and protection circuit internal resistance of less than 20mΩ, delivering extremely low self-consumption and high energy efficiency.
2S 7.4V Lithium Battery Protection Board Key Features
The 2S 7.4V Lithium Battery Protection Board features a high-precision voltage detection circuit for independent monitoring of each cell. Overcharge detection voltage of the 2S 7.4V Lithium Battery Protection Board is 3.75V±0.025V (per cell) with overcharge protection delay of 1 second, overcharge recovery voltage lagging 0.2V behind detection voltage, and overcharge release voltage of 3.7V±0.05V (per cell). Overdischarge recovery voltage of the 2S 7.4V Lithium Battery Protection Board is 2.0V to 2.1V with overdischarge detection delay of 0.1 seconds. Overcurrent detection voltage of the 2S 7.4V Lithium Battery Protection Board is 200mV±25mV with overcurrent detection delay of 12 seconds, overcurrent detection current ranging from 2A to 9A (depending on version), with automatic recovery after overcurrent. Short circuit protection detection delay on the 2S 7.4V Lithium Battery Protection Board is 300 milliseconds with automatic recovery after external short circuit. Protection circuit internal resistance of the 2S 7.4V Lithium Battery Protection Board is less than 20mΩ. Operating current is less than 30μA, sleep current (during overdischarge) is less than 20μA, and single-cell static loss current is as low as 3μA. Operating temperature range of the 2S 7.4V Lithium Battery Protection Board is -40℃ to +50℃. Board dimensions of the 2S 7.4V Lithium Battery Protection Board are 90×45×0.68mm.
Four Protection Mechanisms
2S 7.4V Lithium Battery Protection Board Overcharge Protection: When any cell voltage rises to overcharge detection voltage (3.75V±0.025V), the 2S 7.4V Lithium Battery Protection Board cuts off the charging circuit after a 1-second delay, preventing battery damage or safety hazards from overcharging. Protection is automatically released when voltage recovers to overcharge release voltage (3.7V±0.05V).
2S 7.4V Lithium Battery Protection Board Overdischarge Protection: When any cell voltage drops to the overdischarge protection threshold, the 2S 7.4V Lithium Battery Protection Board cuts off the discharge circuit after a 0.1-second delay, preventing battery damage from overdischarge. Automatic recovery when voltage returns to 2.0V to 2.1V.
2S 7.4V Lithium Battery Protection Board Overcurrent Protection: When discharge current exceeds the set threshold, the 2S 7.4V Lithium Battery Protection Board cuts off the circuit after a 12-second delay with automatic recovery, effectively preventing high current damage to batteries and devices.
2S 7.4V Lithium Battery Protection Board Short Circuit Protection: When an external short circuit occurs at the output, the 2S 7.4V Lithium Battery Protection Board rapidly cuts off the circuit within 300 milliseconds, with automatic recovery after the short circuit is removed, effectively preventing safety accidents caused by short circuits.
2S 7.4V Lithium Battery Protection Board Applications
The 2S 7.4V Lithium Battery Protection Board is specifically designed for 2S 7.4V lithium battery packs and is widely used in various devices powered by two 18650 cells in series. 2S 7.4V Lithium Battery Protection Board Power Tools: drills, saws, electric screwdrivers. 2S 7.4V Lithium Battery Protection Board Vacuum Cleaners: cordless vacuums. 2S 7.4V Lithium Battery Protection Board Electric Toys and RC Models: remote-controlled cars, drones. 2S 7.4V Lithium Battery Protection Board Smart Robots: robotic cleaners. 2S 7.4V Lithium Battery Protection Board Portable Lighting Equipment: flashlights, headlamps. 2S 7.4V Lithium Battery Protection Board E-bike Battery Packs: electric bicycles. 2S 7.4V Lithium Battery Protection Board Solar Energy Storage Systems: small-scale solar backups. 2S 7.4V Lithium Battery Protection Board Security Surveillance Equipment: backup for camera systems. 2S 7.4V Lithium Battery Protection Board Industrial Instruments: portable testing devices. 2S 7.4V Lithium Battery Protection Board Portable Medical Equipment: patient monitors. 2S 7.4V Lithium Battery Protection Board Communication Equipment: backup power for radio devices. 2S 7.4V Lithium Battery Protection Board Audio Equipment: portable speakers, and various 18650 battery pack assembly projects.
2S 7.4V Lithium Battery Protection Board Key Advantages
2S 7.4V Lithium Battery Protection Board Six Current Versions: Six continuous current versions flexibly available (2A, 3A, 4.5A, 6A, 7.5A, 9A), allowing users to select the most suitable version based on device power requirements.
2S 7.4V Lithium Battery Protection Board Comprehensive Safety: Integrated overcharge, overdischarge, overcurrent, and short circuit protection mechanisms provide comprehensive battery safety and effectively extend battery service life.
2S 7.4V Lithium Battery Protection Board High-Precision Detection: High-precision voltage detection circuit with overcharge detection voltage accuracy of ±0.025V ensures precise protection for each cell.
2S 7.4V Lithium Battery Protection Board Ultra-Low Internal Resistance: Protection circuit internal resistance of less than 20mΩ minimizes power loss and heat generation, improving overall energy efficiency.
2S 7.4V Lithium Battery Protection Board Ultra-Low Standby Consumption: Single-cell static loss current as low as 3μA, operating current less than 30μA, and sleep current less than 20μA significantly extend battery pack standby time.
2S 7.4V Lithium Battery Protection Board Auto-Recovery: Automatic recovery after both overcurrent and short circuit protection eliminates the need for manual intervention for convenient use.
2S 7.4V Lithium Battery Protection Board Thin & Compact Design: Ultra-thin design of 90×45×0.68mm enables easy integration into various compact devices.
Why Choose QIXINWEI
Years of experience in the electronics industry. Trusted by global customers.
Massive In-Stock Inventory – Ready to ship promptly
BOM Matching Service – One-stop solution, save time
PCBA Customization – Professional engineering team creates tailor-made solutions based on your needs
Cost-Effective & Efficient – Better channel, better cost
A dedicated team makes your procurement smoother.
Contact us for BOM quotes or PCBA inquiries
FAQ
1. What is this protection board?
It is a protection board designed for 2S (7.4V) lithium battery packs (e.g., 18650, Li-Po) to prevent overcharge, over-discharge, overcurrent, and short circuit.
2. What are the key specifications?
Battery Type: 2S (7.4V) Li-ion/Polymer
Charging Voltage: 8.4V ~ 9V
Charging Current: 2A ~ 9A (depending on version)
Overcharge Detection: 3.75V ± 0.025V per cell
Over-discharge Release: 2.0V ~ 2.1V per cell
Quiescent Current: ≤30µA
Operating Temp: -40℃ ~ +50℃
Internal Resistance: ≤20mΩ
Dimensions: 90 * 45 * 0.68mm
3. What current versions are available?
It offers 2A, 3A, 4.5A, 6A, 7.5A, and 9A continuous discharge current versions to suit different load requirements.
4. How do I connect it?
The board has four pads: B+, B-, P+, P-.
B+ → Battery pack positive
B- → Battery pack negative
P+ → Charge/Discharge positive (common port)
P- → Charge/Discharge negative (common port)
5. What protection features does it have?
Four protection mechanisms:
Overcharge Protection: Cuts off charging when per-cell voltage ≥3.75V, resumes ~3.7V
Over-discharge Protection: Cuts off discharging when voltage too low, resumes at 2.0~2.1V
Overcurrent Protection: Cuts off when current exceeds rated value, auto-recovery
Short Circuit Protection: Cuts off within <300ms on external short, auto-recovery
6. Which batteries are suitable?
Suitable for 7.4V (2S) Li-ion or Li-Po batteries (e.g., 18650, 26650, pouch cells). Not for LiFePO₄ (3.2V/cell) or other chemistries.
7. How to choose the right current version?
Select based on the device's maximum operating current. For example, if peak current is 5A, choose the ≥5A version (e.g., 6A). Leave some margin.
8. What is the operating temperature range?
Operating: -40℃ to +50℃
Storage: -40℃ to +50℃ (same as operating)
9. What are the dimensions and mounting?
Dimensions: 90mm × 45mm × 0.68mm, ultra-thin, suitable for integration inside battery packs or devices. Connect via soldering.
10. What precautions should be taken?
Polarity: Do not reverse B+/B- or P+/P-.
Current Matching: Choose a version matching your load to avoid overloading.
First Use: If no output after connection, try charging to activate the board.
Heat Dissipation: Ensure good ventilation when operating at high currents.