Small DC USB UPS for routers and similar
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This model is based around an aliexpress PCB. Helps keep up to 15W of small critical DC loads powered during outages.
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- Printables
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- Electronics
- Licencja
- Creative Commons — Attribution
This small enclosure is designed to hold an all-in-one DC UPS board from AliExpress, allowing you to build a compact backup power supply for routers or other small DC devices.
Required Components to build a fully functional UPS:
2× 18650 Li-ion batteries
(e.g. salvaged from old laptops or power banks)1× DC UPS board from AliExpress
5, 9 and 12V versions available based on your router voltage.
1× DC output cable with the correct barrel plug for your device
1× USB charger (≥15 W)
1× USB-C cable
Real-world Use:
The UPS I built in 07/2023 is still running today.
In 2025, I replaced the original 18650 cells after the runtime dropped from ~2 hours to ~30 minutes. With fresh cells installed, the UPS can now power my router for up to 3 hours.
My UPS is placed below my desk and secured with a couple of screws on the desk's leg. I used a bit of hot glue to secure the board and wires inside the assembly. The cover should be a tight fit.
⚠ Disclaimer:
Working with electricity and lithium-ion batteries can be dangerous and may result in property damage, injury, or death.
I strongly recommend purchasing a fully assembled UPS from a reputable manufacturer if you are not experienced.
I am not responsible for any damage or injury resulting from the use of this model or the information provided.