WSAL18193 – UPS Power Module/en

Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

Technical quick reference for the Waveshare UPS module that provides stable 5 V power to a Jetson Nano Developer Kit. Covers specifications, wiring, OLED display, commands, and safety practices.

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Technical overview

The module outputs a constant 5 V with up to 2.5 A continuous current via an onboard regulator.
Communication uses the I²C bus; battery voltage, current, power, and remaining capacity are monitored in real time.
A 0.91-inch OLED displays information such as battery voltage, IP address, and RAM usage.
It supports 18650 lithium batteries (not included); four batteries provide a total capacity of 10400 mAh.
The charging port expects the included 8.4 V / 2 A charger.
A physical switch turns the Jetson Nano Developer Kit on or off.
Warning LEDs indicate reversed battery orientation; they stay off when batteries are mounted correctly.
Dimensions are 113 mm × 79 mm with 2.5 mm mounting holes.

Commands and examples – verify before use:

sudo apt-get install python3-smbus -y
sudo apt-get install python-smbus -y
git clone https://github.com/waveshare/UPS-Power-Module
cd UPS-Power-Module
sudo ./install.sh
python3 -m ups_display.ina219
sudo python3 -m ups_display.display_server
sudo systemctl disable ups_display
sudo pip3 uninstall ups_display

Notes and version constraints

Batteries are not included; use only manufacturer-grade 18650 cells.
Use only the supplied 8.4 V / 2 A charger; other adapters may damage the module.
On first use, batteries must be activated by charging on board; the device may not work until then.
Lithium batteries have limited cycle life and should be replaced at max cycles or after two years, whichever comes first.
Wiring: connect 5 V to 5 V and 3.3 V to 3.3 V; incorrect mapping can destroy the Jetson Nano.
Negative current means discharge (battery powering the device); positive current means charging.
If the OLED does not display, run 'sudo python3 -m ups_display.display_server'; if it works, disable and reinstall the boot service.
When reconnecting the battery, keep the unit connected to the power supply so the switch responds.
Standby runtime is approximately 10–12 hours; other load profiles are untested.
Charging while powered off takes about four hours.

Source and revision record

UPS Power Module - Waveshare Wiki
Source revision: 72164
Captured: 2026-09-01T03:13:03+00:00
SHA-256: 0de4793cb4c29bec1a44809f393c9a93e83ea86af9a582330bc773764e5c7c03