21V 18650 Battery Holder Box 5S 10S 15S – DIY Angle Grinder Kit
21V 18650 Battery Holder Box 5S 10S 15S – DIY Angle Grinder Kit
21V 18650 Battery Holder Box – 5S / 10S / 15S DIY Assembly Kit for Electric Angle Grinders
Build or rebuild your own lithium-ion battery pack with this versatile 21V 18650 Battery Holder Box. Designed for DIY enthusiasts and tool repair projects, this plastic battery case supports 5S, 10S, and 15S cell configurations — making it compatible with a wide range of electric angle grinders and other 18V/21V cordless power tools.
Key Features
- Durable Plastic Construction: Made from high-quality, impact-resistant plastic that keeps your 18650 lithium-ion cells firmly in place and protected from everyday wear.
- Precision-Fit Design: Engineered to the exact dimensions of standard 18650 cells, ensuring a snug, secure fit for easy installation and hassle-free battery replacement.
- Temperature Management: The enclosure helps insulate cells from extreme ambient temperatures, helping maintain consistent battery performance during demanding tasks.
- Multi-Configuration Support: Compatible with 5S, 10S, and 15S cell arrangements to suit different voltage and capacity requirements for your DIY power tool build.
- DIY-Friendly Assembly: Comes as a complete set (1 set per package), ideal for hobbyists, makers, and anyone looking to assemble or upgrade a custom battery pack at home.
Specifications
- Compatible Cell Type: 18650 Lithium-Ion
- Configurations: 5S / 10S / 15S
- Output Voltage: 21V
- Material: Plastic
- Color: As shown in product images
- Package Contents: 1 × Battery Holder Box Set
- Country of Origin: Made in Mainland China
Note: Please allow a 2–5% measurement tolerance due to manual sizing. Colors may appear slightly different depending on monitor settings and lighting conditions.
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Frequently Asked Questions
Q: What cell type is compatible with this 18650 battery holder box?
A: This battery holder box is specifically designed for standard 18650 lithium-ion cells. It supports 5S, 10S, and 15S configurations to reach the 21V output needed for compatible electric angle grinders and DIY power tool builds.
Q: Does this kit include the 18650 batteries?
A: No, the 18650 battery cells are not included. The package contains the plastic battery holder/case assembly only. You will need to source your own 18650 lithium-ion cells separately to complete your DIY battery pack.
Q: Is this battery holder box compatible with other power tools besides angle grinders?
A: Yes! While it is designed with electric angle grinders in mind, this 21V 18650 battery holder can be used in a variety of DIY power tool or electronics projects that require a 5S, 10S, or 15S lithium-ion cell configuration at 21V output.
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.