WSAL19694 – Pico-UPS-A/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 Pico UPS A is an uninterruptible power supply module for the Raspberry Pi Pico series. It incorporates a Li-ion battery switching charger with dynamic power path management and a monitoring chip that provides real-time monitoring of voltage, current, power, and remaining capacity via I2C.

Related products at JW Tech

WSAL19694 – UPS Module for Raspberry Pi Pico, Uninterruptible Power Supply

Technical overview

Supports the standard Raspberry Pi Pico header for the Pico series
Li-ion battery switching charger with dynamic power path management
I2C bus communication 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 feature
Onboard indicators for recharging, power, and battery warning
Specifications: recharge voltage 5 V, I2C control bus, supports 800 mAh 14500 batteries (not included), dimensions 60 x 21 mm

Commands and examples – verify before use:

wget -P ~/pico https://files.waveshare.com/upload/5/5a/Pico-UPS-A.zip
cd ~/pico && unzip Pico-UPS-A.zip
cd ~/pico/Pico-UPS-A/c/build/ && cmake -DPICO_BOARD=pico -DPICO_PLATFORM=rp2040 .. && make
sudo mount /dev/sda1 /mnt && sudo cp Pico_UPS.uf2 /mnt && sudo sync && sudo umount /mnt && sleep 2 && sudo minicom -b 115200 -o -D /dev/ttyACM0

Notes and version constraints

Li-ion and Li-po batteries are unstable and can cause fire, personal injury, or property damage if not properly charged or used
Do not reverse-connect polarities when charging or discharging; do not use inferior chargers
Do not mix old and new batteries or different brands
Lithium batteries have limited cycle life; replace when max cycles reached or after two years of operation
Keep batteries away from inflammables, explosives, and children
The listed commands assume a working Raspberry Pi environment; exact COM port mapping varies by computer
Flashing Pico2 firmware may cause the device to become unrecognized – only use the firmware provided in the package

Source and revision record

Pico UPS A - Waveshare Wiki
Source revision: 91355
Captured: 2026-09-02T02:43:31+00:00
SHA-256: 2925e74347cd0a6be173e46531f47f185da0145352a1451029febf85f94f35bf