DIY 21700 Power Bank Case - Batteries Not Included
Build a matched portable charging arrangement around two flat-top 21700 cells. This detachable case supplies the housing and charging electronics, with batteries purchased separately.
✅ Replace cells without replacing the case - The detachable design gives access to the supported battery compartments.
✅ Charge supported smaller loads - A low-current mode provides an option for devices that need the appropriate lower-load behaviour.
✅ Keep a charging lead with the case - The included dual-ended cable also provides the listed lanyard arrangement.
Select the Cells Before Treating It as a Power Bank
Use only matching cells specified for the case and follow its assembly and charging instructions. The available stored energy depends on the installed cells; the empty case has no battery capacity.
The maximum rated power is 22.5 W under supported conditions. Actual charging depends on the cells, cable and connected device, with white and grey case selections available.
Technical details
- For two flat-top 21700 cells
- Detachable battery-access format
- USB-C input/output
- Up to 22.5 W rated power
- Low-current mode
- Includes case and dual-ended cable
- Batteries not included
Choose the case for your correctly matched 21700 charging build.
Choose options