5-Pack 2S 7.4V BMS Li-ion Battery Protection Board 18650

5-Pack 2S 7.4V BMS Li-ion Battery Protection Board for 18650 Cells

Keep your 18650 lithium-ion battery packs safe and performing at their best with this 5-pack of 2S 7.4V BMS (Battery Management System) protection boards. Available in six current ratings — 2A, 3A, 4.5A, 6A, 7.5A, and 9A — these compact boards provide essential overcharge, over-discharge, and short-circuit protection for 2-cell series Li-ion and LiPo battery configurations. Whether you're building custom battery packs, repairing power tools, or prototyping electronics projects, these boards are a reliable and cost-effective solution.

Key Features

• 6 Current Ratings Available: 2A (1 MOS), 3A (2 MOS), 4.5A (3 MOS), 6A (4 MOS), 7.5A (5 MOS), 9A (6 MOS) — choose the spec that matches your project
• 2S Configuration: Designed for 2 cells in series at 7.4V nominal voltage
• Continuous Discharge Current: 2A–9A depending on selected variant
• Charging Voltage: 3.7V per cell (standard Li-ion charging)
• Charging Current: 2A–9A (matches the board's rated current)
• Quiescent Current: ≤3µA — minimal standby draw to preserve battery life
• Nickel Strip Contact Points: Pre-fitted nickel strip/tape for easy cell welding or tab attachment
• Compact & Lightweight: Easy to integrate into tight battery enclosures
• High-Quality Construction: New, premium-grade components throughout
• Made in Mainland China

Specifications

What's in the Box?

• 5 × 2S 7.4V BMS Li-ion Battery Protection Boards (same spec per pack)

Important Notes

• Due to manual measurement, please allow a tolerance of ±1–3mm.
• Actual product color may vary slightly from images due to monitor display differences.

Related Products You May Like

• T2 Pure Bare Copper Wire 0.1–2mm Round Solid Uncoated 10M — ideal for wiring battery pack connections
• 5-Pair Nitrile Work Gloves – Anti-Slip Full Finger Safety — protect your hands during battery assembly
• Ball End Hex Screwdriver Bit – Magnetic Reduced Shank Steel — handy for securing battery enclosure hardware

Learn more: ENERGY STAR product efficiency guidance

Frequently Asked Questions

Q: What does a BMS protection board do for a Li-ion battery pack?

A: A Battery Management System (BMS) protection board monitors and manages each cell in a lithium-ion battery pack. It actively prevents overcharging, over-discharging, and short circuits — all of which can damage cells or create safety hazards. The board also helps balance cell voltages, extending the overall lifespan and performance of your 18650 or LiPo battery pack.

Q: Which current rating should I choose for my project?

A: Select a current rating that meets or slightly exceeds the maximum continuous current draw of your device. For example, if your application draws up to 4A continuously, the 4.5A (3 MOS) board is appropriate. Choosing a higher-rated board provides a safety margin and reduces heat buildup under load.

Q: Are these boards compatible with LiPo batteries as well as 18650 cells?

A: Yes. These 2S 7.4V BMS boards are compatible with any standard 2-cell series Li-ion or LiPo battery configuration that operates at 7.4V nominal. This includes 18650 cylindrical cells as well as flat LiPo pouches used in RC vehicles, DIY power banks, and similar electronics projects.

Q: Does the pack include multiple different ratings or all the same rating?

A: Each 5-pack contains boards of a single selected specification. You choose the current rating (2A, 3A, 4.5A, 6A, 7.5A, or 9A) at the time of purchase, and all five boards in the pack will be that same rating.

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.