5S 20A BMS 18650 Li-ion Battery Protection Board PCM Balancer

$11.37 $13.64

5S 20A BMS 18650 Li-ion Battery Protection Board with Cell Balancer

Keep your lithium battery packs running safely and efficiently with this 5S 20A Battery Management System (BMS) Protection Board. Designed for 18650 Li-ion and lithium battery packs, this compact PCM (Protection Circuit Module) features built-in cell balancing, automatic charge regulation, and multi-layer safety protection — all in a small, easy-to-install form factor. Made in Mainland China.

Key Features

Multi-Layer Safety Protection: Guards against overcharge, over-discharge, short circuit, and overheating to keep your battery pack and connected devices secure at all times.
Extended Battery Life: Intelligent charge/discharge control prevents harmful voltage extremes, helping your 18650 cells last significantly longer over repeated cycles.
Low Static Current Consumption: Energy-efficient design minimises idle power drain, making this board an eco-friendly choice for power bank and DIY battery projects.
Automatic Cell Balancing: The integrated balancer automatically identifies each cell's charge state and adjusts current and voltage accordingly — no manual tuning required.
Simple Installation: Connect the positive and negative terminals of your battery cells to the corresponding board pads and you're ready to go. The compact, lightweight PCB fits easily into most enclosures and DIY builds.

Specifications

Configuration: 5S (5-cell series)
Continuous Discharge Current: 20A
Compatible Battery Type: 18650 Li-ion / Lithium
Material: PCB with plastic components
Package Includes: 1 × BMS Protection Board

Perfect For

DIY power bank builds and portable battery packs
Electric bike (e-bike) and scooter battery modules
RC vehicle and robotics battery systems
Solar energy storage and off-grid projects
Custom 18650 battery pack assemblies

Note: Actual colour may vary slightly from images due to monitor brightness and lighting conditions. Please allow for minor measurement tolerances.

Frequently Asked Questions

Q: What does a 5S BMS protection board do for my lithium battery pack?

A: A 5S BMS (Battery Management System) monitors and manages a series string of 5 lithium cells. It provides overcharge protection, over-discharge protection, short circuit protection, and cell balancing — ensuring each cell stays within safe voltage limits for maximum safety and longevity.

Q: Is this BMS board compatible with all 18650 lithium cells?

A: Yes, this 5S 20A BMS protection board is designed to work with standard 18650 Li-ion lithium cells wired in a 5-cell series configuration. It is widely used in DIY power banks, e-bike battery packs, and other custom lithium battery projects.

Q: How do I install the BMS protection board?

A: Installation is straightforward — connect the positive and negative terminals of each battery cell group to the corresponding B+ and B- pads on the board, then connect your load and charger to the P+ and P- ports. No special tools or technical expertise are required for basic assembly.

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.