21700 Power Bank Enclosure Case – DIY 4-Cell 100W Fast Charge

Build Your Own 100W Fast-Charging Power Bank

Take charge of your portable power setup with this 21700 Power Bank Enclosure Case (Model K81). Designed for DIY enthusiasts and tech hobbyists, this modular shell kit lets you assemble a high-capacity portable charger using four 21700 battery cells (sold separately). With support for 100W fast charging, you can top up smartphones, tablets, laptops, and more in a fraction of the time of standard chargers — no specialised tools required.

Key Features

• 100W Fast Charging Support: Significantly speeds up charging time for a wide range of devices, compatible with multiple input voltage standards worldwide.
• Durable ABS Construction: The shell is crafted from high-quality ABS material, delivering excellent impact resistance and long-lasting wear protection.
• Modular, Tool-Free Assembly: All enclosure components are included for straightforward assembly — simply add four 21700 battery cells (not included) and you're ready to go.
• Wide Device Compatibility: Supports charging for smartphones, tablets, laptops, and other USB-powered devices.
• Compact & Portable: Lightweight design (153 × 55 × 34 mm) makes it easy to carry wherever you go.
• Reusable & Eco-Friendly: Designed to be used repeatedly — simply swap or recharge your battery cells as needed.

Specifications

• Model: K81 (02DD13AC809941)
• Material: ABS
• Compatible Battery: 21700 × 4 (batteries NOT included)
• Dimensions: 153 × 55 × 34 mm
• Available Colors: Black / Blue / Gray
• Max Charging Output: 100W
• Battery Included: No
• Charger Included: No
• Made in Mainland China

What's in the Box

• 1 × Power Bank Enclosure Shell Kit (battery cells not included)

Note: Please allow ±1–2 cm variance due to manual measurement. Slight color differences may occur due to display calibration differences between screens.

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Learn more: EPA guidance on lithium-ion battery handling

Frequently Asked Questions

Q: Does this 21700 power bank enclosure come with battery cells?

A: No, battery cells are not included. This kit contains only the enclosure shell and case components. You will need to source four 21700 battery cells separately to complete your DIY power bank build.

Q: What devices can I charge with this 100W power bank enclosure?

A: This enclosure supports 100W fast charging and is compatible with a wide range of devices including smartphones, tablets, and laptops. It also adapts to various international input voltage standards, making it suitable for use across different countries and regions.

Q: Do I need special tools to assemble the K81 power bank case?

A: No special tools are required. The modular design allows for straightforward, tool-free assembly. Simply fit your 21700 battery cells into the enclosure following the included component layout and you're ready to use your DIY power bank.

Q: What material is the power bank enclosure made from?

A: The enclosure is made from ABS (Acrylonitrile Butadiene Styrene), a durable plastic known for its strong impact resistance and wear-proof performance — ideal for everyday portable use.

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.