21V 15-Cell 18650 Li-Ion Battery Case Shell Kit – DIY Pack
21V 15-Cell 18650 Li-Ion Battery Case Shell Kit – DIY Pack
21V 15-Cell 18650 Lithium Battery Shell Kit – DIY Battery Pack Accessories
Build or restore your own 21V battery pack with this versatile 15-cell 18650 Li-Ion Battery Case Kit. Designed for hobbyists, technicians, and electronics enthusiasts who are experienced in battery assembly, this durable plastic and metal shell kit provides everything you need to house and organize 18650 cells into a compact, reliable battery pack — no cells included.
⚠️ Note: This product is a battery case/shell component only. It does not include battery cells. It is intended for use by individuals with practical experience and knowledge in battery assembly and performance.
Key Features
- Fits 15 × 18650 Cells – Supports a 21V nominal output configuration (5S3P or similar layout)
- Durable Construction – Made from high-quality plastic and metal components for long-lasting use
- Compact Form Factor – Dimensions: 4.53 × 2.87 × 3.15 in (11.5 × 7.3 × 8.0 cm) — easy to integrate into DIY power tool or e-bike projects
- Colour: Black – Clean, professional-looking finish
- Repair & Rebuild Friendly – Ideal for repairing existing battery packs or assembling new custom power solutions
- Li-Ion Compatible – Designed specifically for standard 18650 lithium-ion cells
Specifications
| Type | Li-Ion Battery Shell Kit (No Cells Included) |
| Cell Capacity | 1400mAh (per cell, cells not included) |
| Voltage | 21V |
| Cell Slots | 15 Cells |
| Material | Plastic + Metal |
| Dimensions | 4.53 × 2.87 × 3.15 in / 11.5 × 7.3 × 8.0 cm |
| Colour | Black |
| Package Includes | 1 × Battery Shell Kit Set |
| Country of Origin | Made in China |
Who Is This For?
This kit is perfect for experienced DIYers, electronics technicians, and makers who need a reliable housing solution for custom 18650 battery pack builds. Whether you're restoring a power tool battery, building a custom e-bike pack, or prototyping a portable power supply, this shell kit gives you a solid foundation to work with.
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Learn more: EPA guidance on lithium-ion battery handling
Frequently Asked Questions
Q: Does this 21V 18650 battery case kit come with battery cells included?
A: No, this kit is a battery shell/case component only and does not include 18650 lithium-ion cells. You will need to source and install compatible 18650 cells separately. It is designed for users who already have experience handling and assembling lithium battery packs.
Q: What size 18650 cells does this battery case fit?
A: This battery shell kit is designed to accommodate standard 18650 lithium-ion cells across 15 slots, configured for a 21V output pack. Always ensure the cells you use are rated appropriately for your intended application before assembly.
Q: Is this 18650 battery pack kit suitable for beginners?
A: This kit is recommended only for individuals who are already familiar with lithium-ion battery performance, cell handling safety, and have practical hands-on experience in battery assembly. If you are new to battery building, please seek guidance from an experienced professional before attempting assembly.
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.