15x 18650 Li-Ion Battery Case with BMS PCBA Protection Circuit Board – 21V Housing with DC Input Socket

Build your own reliable 21V lithium battery pack with this high-quality 15-slot 18650 battery case. Designed for DIY electronics enthusiasts, hobbyists, and makers, this battery housing features a built-in BMS (Battery Management System) PCBA protection circuit board to help regulate charge and discharge cycles, guarding your cells against over-charge, over-discharge, and short-circuit conditions. The integrated DC input socket makes wiring straightforward and tidy.

Made in Mainland China.

Key Features

Fits 15 x 18650 Li-Ion cells – arranged for a 21V output configuration (cells not included)
Built-in BMS PCBA protection circuit board – helps manage charge/discharge and safeguard your battery cells
21V nominal output with DC input socket for easy integration
Durable construction – robust plastic shell with metal contacts for long-lasting use
DIY-friendly design – ideal for custom power packs, electric tools, e-bikes, RC vehicles, and more
Compact housing – neat, organised cell slots keep batteries secure during use

Specifications

Compatible Cells: 18650 Li-Ion (x15)
Output Voltage: 21V
Material: Plastic + Metal
Includes: BMS PCBA protection circuit board, DC input socket
Origin: Made in Mainland China
Package Includes: 1 x Battery Case Set (batteries NOT included)

Important Notes

Please allow 5–10mm differences due to manual measurement.
Actual colour may vary slightly due to monitor settings and lighting conditions.
18650 cells are NOT included — this listing is for the case/housing and BMS board only.

Related Products You May Like

For guidance on safe lithium battery handling and storage, refer to the U.S. Consumer Product Safety Commission – Lithium Battery Safety.

Learn more: Battery holder

Frequently Asked Questions

Q: Do the 18650 batteries come included with this battery case?

A: No, the 18650 Li-Ion cells are NOT included. This listing covers the 15-slot battery housing, the BMS PCBA protection circuit board, and the DC input socket only. You will need to source 15 x 18650 cells separately.

Q: What does the BMS protection circuit board do?

A: The BMS (Battery Management System) PCBA monitors and manages your 18650 Li-Ion cells during charging and discharging. It helps protect against over-charging, over-discharging, and short-circuit events, extending the life of your battery pack and improving overall safety.

Q: What is the output voltage of this 15x 18650 battery case?

A: This battery case is designed for a 21V output configuration when loaded with 15 x 18650 Li-Ion cells connected in the appropriate series arrangement.

Q: Is this suitable for DIY electric tools or e-bike battery packs?

A: Yes — this case is popular for DIY power projects including custom battery packs for power tools, electric scooters, RC vehicles, and portable power stations. Always ensure your cells and wiring are rated appropriately for your specific application.

Made with care

Great value

Elegant design

Quality materials

This product is crafted with quality materials to ensure durability and performance. Designed with your convenience in mind, it seamlessly fits into your everyday life.

We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.

We are committed to ensuring a positive shopping experience for all our customers. If for any reason you wish to return an item, we invite you to reach out to our team for assistance, and we will evaluate every return request with care and consideration.