21V Li-ion BMS Protection Circuit Board Box | 18650 DIY Pack
21V Li-ion BMS Protection Circuit Board Box | 18650 DIY Pack
21V Lithium Battery BMS Protection Circuit Board Housing
Build your own reliable power pack with this sturdy 21V Lithium Battery BMS Protection Circuit Board Box. Designed for 10, 15, 20, or 30 × 18650 Li-ion cells, this housing integrates a Battery Management System (BMS) / PCBA protection circuit board to keep your DIY battery pack safe, organized, and performing at its best.
Why Choose This Battery Box?
- Built-in BMS/PCBA Protection: Guards against overcharge, over-discharge, and short-circuit conditions, extending the life of your 18650 cells.
- Multiple Cell Configurations: Supports 10, 15, 20, or 30 × 18650 cells — perfect for a wide range of DIY power projects.
- Durable Plastic & Metal Construction: A tough outer shell protects the internal circuitry and keeps all components securely housed.
- Easy Installation: Tool-friendly design makes assembly straightforward, even for first-time DIY builders.
- Secure Socket Design: Integrated housing socket ensures solid electrical connections and neat wiring.
- Versatile DIY Application: Ideal for e-bike battery packs, power tool upgrades, portable power stations, and other electronics projects.
Specifications
- Compatible Cells: 18650 Li-ion batteries (batteries NOT included)
- Cell Configurations: 10 / 15 / 20 / 30 cells
- Voltage: 21V
- Materials: Plastic & Metal
- Includes: 1 × Battery Case Housing with integrated BMS/PCBA circuit board
- Batteries: Not included
Made in Mainland China.
Note: Actual color may vary slightly from product images due to monitor settings and lighting conditions. Please allow for minor measurement tolerances.
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Frequently Asked Questions
Q: What 18650 battery configurations does this BMS protection circuit board box support?
A: This 21V lithium battery housing is designed to accommodate 10, 15, 20, or 30 × 18650 Li-ion cells, giving you flexibility for a variety of DIY power pack builds. Please select your required configuration at checkout.
Q: Are 18650 batteries included with the battery case?
A: No, the 18650 Li-ion batteries are not included. This listing is for the BMS protection circuit board housing/shell only. You will need to source compatible 18650 cells separately to complete your DIY battery pack.
Q: What does the integrated BMS/PCBA protection circuit board do?
A: The built-in Battery Management System (BMS) monitors and manages your lithium battery cells by protecting against overcharging, over-discharging, and short circuits. This extends battery lifespan and helps maintain safe, stable operation for your DIY power projects.
Q: What kind of DIY projects is this 21V battery box suitable for?
A: This battery housing is highly versatile and well-suited for e-bike battery pack builds, power tool battery upgrades, portable power stations, RC vehicles, solar storage projects, and other electronics or maker-space applications requiring a 21V lithium battery pack.