3S Router Backup Power Module, DC or DC/USB Outputs

Build a matching low-voltage backup supply for a router setup with a board-level module. It is for experienced makers integrating a suitable protected battery pack.

• ✅ Provide a backup path — The module switches to a compatible battery source when input power fails.
• ✅ Supply different voltages — Specified output ports serve different approved loads.
• ✅ Check battery level — Four indicator levels show remaining charge.
• ✅ Choose the output format — DC-only and DC/USB variants are separate.

Plan the battery and loads as a complete system

The board references an 11.1V 3S lithium pack with a 12.6V full-charge level. Match battery protection, input supply and wiring before integration.

Total output is stated up to 40W; do not add every port maximum as though they are simultaneous. The product is a module and terminal wire, not a complete enclosed UPS.

Technical details

• Input: DC 12.6–13V
• Battery reference: 3S 11.1V lithium
• DC outputs: Two 12V/1.5A and one 9V/2A
• USB version: 5V/2A output
• Total output: Stated 40W
• Board: 73.5 × 63mm
• Package: Module and terminal wire

Confirm battery protection and load requirements before building the backup system.

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