20x18650 21V 60A BMS Balance Charging PCB Battery Case Board

Power your DIY battery projects with confidence using this 20x18650 21V 60A Lithium-Ion Battery Case with BMS Balance Charging PCB Circuit Board. Designed to house 20 standard 18650 Li-ion cells, this module features a built-in Battery Management System (BMS) that ensures safe, balanced charging and discharging across all cells — protecting your pack from overcharge, over-discharge, and short-circuit events.

Whether you're building a custom e-bike battery, a DIY power tool pack, or a portable power station, this rugged plastic and metal enclosure delivers reliable performance in a compact, easy-to-integrate form factor. The integrated LED indicator gives you a clear, at-a-glance view of the battery status at all times.

Key Features

• Configuration: Fits 20 x 18650 Li-ion cells (cells not included)
• Output Voltage: 21V nominal (5S configuration)
• Continuous Discharge Current: Up to 60A
• BMS Balance Charging: Active cell balancing for maximum capacity and longevity
• Built-in Protections: Overcharge, over-discharge, overcurrent, and short-circuit protection
• LED Indicator: Visual battery level and status display
• Compatible With: BL1860, BL1830 format Li-ion cell packs and similar 18650 cylindrical cells
• Construction: Durable plastic shell with metal contact components

Who Is This For?

This battery case and BMS board is ideal for electronics hobbyists, makers, and engineers who need a reliable, high-current 21V lithium battery pack solution. It's a smart choice for power tool battery rebuilds, robotics, electric vehicles, and portable energy storage projects.

Specifications

• Cell Compatibility: 18650 Li-ion cylindrical cells
• Number of Cells: 20 (5S4P configuration)
• Nominal Voltage: 21V
• Max Continuous Current: 60A
• PCB Type: BMS Balance Charging Circuit Board
• Material: Plastic + Metal
• Indicator: LED status display

For guidance on safe handling of lithium-ion battery systems, refer to the U.S. Consumer Product Safety Commission (CPSC) Lithium-Ion Battery Safety resources.

Frequently Asked Questions

Q: What does the BMS (Battery Management System) do in this 18650 battery case?

A: The BMS monitors and manages each cell in the 20x18650 pack, providing active cell balancing during charging, and protecting against overcharge, over-discharge, overcurrent, and short-circuit conditions. This extends battery life and keeps your pack operating safely and efficiently.

Q: Are 18650 cells included with this battery case and PCB board?

A: No, the 18650 lithium-ion cells are not included. This product includes the battery case enclosure, the BMS balance charging PCB circuit board, and the LED indicator — you supply your own 18650 cells (20 cells required for a full 5S4P 21V pack).

Q: What projects is this 21V 60A BMS battery case suitable for?

A: This module is well-suited for DIY power tool battery rebuilds (compatible with BL1860/BL1830 format packs), e-bike battery assemblies, robotics power systems, portable power stations, and other custom electronics projects requiring a reliable 21V high-current lithium battery solution.

Q: What is this battery case made of?

A: The enclosure is constructed from durable plastic with metal contact components, providing a solid, lightweight housing for your 18650 cell pack and BMS PCB board.