DIY Power Bank Case for Two 21700 Cells
Build a portable power-bank setup around suitable rechargeable cells. This quick-release case accepts two flat-top 21700 batteries, supplied separately.
✅ Replace compatible cells when needed - The detachable quick-release design gives access to the batteries instead of sealing them into the housing.
✅ Power suitable low-current devices - A low-current mode supports an appropriate operating setting for smaller loads.
✅ Keep a cable with the case - The supplied dual-ended cable also works as a carrying lanyard.
This Is a Case, Not a Complete Battery Pack
Install only matching flat-top 21700 cells that meet the case's requirements. Observe polarity and the cell and case instructions; batteries are not included.
USB-C input and output support specified power modes up to 22.5 W with compatible equipment. Available energy depends on the installed cells, so no fixed capacity applies to the empty housing.
Technical details
- DIY power-bank case
- Two flat-top 21700 cells required, not included
- Quick-release battery access
- USB-C input / output
- Up to 22.5 W on supported modes
- Low-current mode
- Case and dual-ended cable
Choose the case for a correctly matched two-cell power-bank build.
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