BMS 5S 20A Li-Ion Battery Protection Board with Balancer

$3.27 USD $3.67 USD

BMS 5S 20A 18650 Lithium Battery Protection Board with Cell Balancer

Keep your lithium battery packs running safely and efficiently with this compact 5S 20A Battery Management System (BMS). Designed for 18650 Li-ion cells, this PCM circuit board actively monitors and manages your battery pack's charge and discharge cycles — automatically protecting your cells and extending their usable lifespan.

Key Features

Multi-Layer Safety Protection: Built-in overcharge, over-discharge, overcurrent, and short-circuit protection circuits guard your battery pack against hazardous conditions, keeping both your cells and connected devices safe.
Active Cell Balancing: The integrated balancer equalizes voltage across all 5 cells in series, ensuring uniform charging and discharging for optimal pack performance and longevity.
Extended Battery Life: Precise charge and discharge control prevents the cell degradation that comes from overcharging or deep discharging, so your battery pack lasts significantly longer.
Low Standby Power Consumption: Ultra-low static current draw minimizes energy loss when the battery is idle — more efficient and environmentally friendly.
Automatic Adaptation: Intelligently detects the battery's charging status and automatically adjusts current and voltage — no manual tuning required.
Easy Installation: Simply connect the positive and negative terminals of your battery cells to the corresponding board pads. Compact form factor fits easily into DIY power bank builds, e-bike packs, RC projects, and more.

Specifications

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

What's in the Box

1 × 5S 20A BMS Lithium Battery Protection Board with Balancer

Made in Mainland China.

Note: Actual color 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 BMS 5S 20A protection board do?

A: A BMS (Battery Management System) 5S 20A board manages a series pack of five 18650 lithium cells. It continuously monitors each cell for overcharge, over-discharge, overcurrent, and short-circuit conditions, cutting off the circuit when unsafe levels are detected. The built-in balancer also equalizes cell voltages during charging for improved performance and cell life.

Q: Is this BMS compatible with 18650 lithium battery packs?

A: Yes. This board is specifically designed for 5-cell (5S) 18650 Li-ion lithium battery configurations. It is commonly used in DIY power banks, e-scooters, RC vehicles, portable energy storage, and other custom lithium battery pack projects requiring up to 20A continuous discharge current.

Q: How do I install the 5S BMS protection board?

A: Installation is straightforward — connect the positive and negative terminals of each battery cell to the labeled pads on the circuit board. No additional configuration is needed. The board automatically detects battery status and begins managing charge and discharge cycles immediately upon connection.

Q: Does this board support cell balancing?

A: Yes. This BMS module includes a built-in cell balancer (PCM balancer) that actively equalizes the voltage across all 5 cells in the series pack. This helps prevent individual cells from becoming over- or under-charged relative to the others, which is key to maximizing the lifespan and safety of your battery pack.

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.