WSAL20662 – UPS Power Module (B)/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

The Waveshare UPS Power Module (B) is an uninterruptible power supply with a 5 V output and up to 5 A continuous current, connecting to the Jetson Nano via pogo pins. Batteries are not included.

Related products at JW Tech

• WSAL20662 – Uninterruptible Power Supply UPS Module (B) for Jetson Nano, 5V Output, up to 5A Current, Pogo Pins Connector
• WSAL20663 – Uninterruptible Power Supply UPS Module (B) for Jetson Nano, 5V Output, up to 5A Current, Pogo Pins Connector
• WSAL24734 – Uninterruptible Power Supply UPS Module (B) for Jetson Nano, 5V Output, up to 5A Current, Pogo Pins Connector

Technical overview

• Output voltage: 5 V; charger: 8.4 V / 2 A; control bus: I2C
• Supports 18650 Li batteries (not included); capacity: 4 battery slots
• Dimensions: 100 mm × 79 mm; mounting hole pattern: 2.5 mm
• I2C bus for real-time monitoring of battery voltage, current, power, and remaining capacity
• Multiple battery protection circuits: overcharge/over-discharge, overcurrent, short-circuit, reverse-polarity protection, plus equalizing charge
• Onboard 5 V regulator with up to 5 A continuous output current
• Battery warning LEDs indicate whether each battery is connected correctly
• Connects to the Jetson Nano via pogo pins; set the power switch to OFF before installing batteries

Commands and examples – verify before use: 

sudo apt-get install python3-smbus
wget https://files.waveshare.com/upload/a/a2/UPS_Power_Module_B.zip
unzip UPS_Power_Module_B.zip
cd UPS_Power_Module_B
python3 INA219.py

Notes and version constraints

• After first installation or replacement of the batteries, press the boot button to activate the circuit
• A negative current reading means the batteries are discharging; a positive reading means they are charging
• Sustained operation at 5 A causes heating; no more than 4 A is recommended for long-term use
• Use only the supplied charger; other sources may damage the module due to excessive ripple
• If a battery is connected in reverse, the warning LED lights up; charging in this state is prohibited
• Standby duration is approximately 10–12 hours; a full charge from empty takes about 4 hours
• Li-ion batteries have limited cycle life and should be replaced after reaching maximum cycles or two years, whichever comes first

Source and revision record

• UPS Power Module (B) - Waveshare Wiki
• Source revision: 67577
• Captured: 2026-09-02T04:09:52+00:00
• SHA-256: f31c35005f04fbf7b1d1f7d49551cade8801edbff81532ce061d25f83e714d54