3S 40A BMS 11.1V / 12.6V 18650 Lithium Battery Protection Board – Battery Management System

The 3S 40A BMS (Battery Management System) is a powerful protection board designed for 3-cell (3S) 18650 lithium-ion battery packs. It ensures safe charging, discharging, and balancing of each cell, protecting your batteries from overcharge, over-discharge, overcurrent, and short circuit.

This module is ideal for DIY battery packs, e-bikes, solar systems, power banks, and robotics projects requiring reliable lithium battery management.

🔹 Features:

Supports 3S (3-cell) 18650 Li-ion battery packs

Overcharge, over-discharge, and short-circuit protection

40A continuous discharge current capacity

High-quality MOSFETs for stable performance

Compact, durable PCB design

Balancing function for equal cell voltage

 Applications:

11.1V / 12.6V 18650 lithium battery packs

DIY power banks and battery storage systems

Electric bikes and scooters

Solar power projects

Robotics and embedded systems 

Keep your lithium batteries safe, efficient, and long-lasting with this 3S 40A BMS protection board — trusted performance for every power project!

⚙️ Specifications (for Shopify “Product Specifications” section):

Battery Type: 3S 18650 Lithium-ion

Input Voltage: 11.1V nominal / 12.6V max

Charging Voltage: 12.6V

Continuous Discharge Current: 40A

Overcharge Detection Voltage: 4.25 ± 0.05V

Over-discharge Detection Voltage: 2.55 ± 0.05V

Short Circuit Protection: Yes

Balancing Function: Yes

Dimensions: Approx. 59 × 21 × 4 mm

Weight: Approx. 10 g

• 🚚 Shipping & Delivery
  We offer fast nationwide delivery across Pakistan. Orders are processed within 24 hours and usually delivered within 2–4 working days. All products are securely packed for safe arrival.

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