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'''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.<br />
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== Summary ==<br />
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.<br />
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== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL19694 WSAL19694 – UPS Module for Raspberry Pi Pico, Uninterruptible Power Supply]<br />
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== Technical overview ==<br />
* Supports the standard Raspberry Pi Pico header for the Pico series<br />
* Li-ion battery switching charger with dynamic power path management<br />
* I2C bus communication for real-time monitoring of battery voltage, current, power, and remaining capacity<br />
* Multiple battery protection circuits: overcharge/over-discharge, overcurrent, short-circuit, reverse polarity protection, plus equalizing charge feature<br />
* Onboard indicators for recharging, power, and battery warning<br />
* Specifications: recharge voltage 5 V, I2C control bus, supports 800 mAh 14500 batteries (not included), dimensions 60 x 21 mm<br />
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'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
wget -P ~/pico https://files.waveshare.com/upload/5/5a/Pico-UPS-A.zip<br />
cd ~/pico && unzip Pico-UPS-A.zip<br />
cd ~/pico/Pico-UPS-A/c/build/ && cmake -DPICO_BOARD=pico -DPICO_PLATFORM=rp2040 .. && make<br />
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<br />
</syntaxhighlight><br />
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== Notes and version constraints ==<br />
* Li-ion and Li-po batteries are unstable and can cause fire, personal injury, or property damage if not properly charged or used<br />
* Do not reverse-connect polarities when charging or discharging; do not use inferior chargers<br />
* Do not mix old and new batteries or different brands<br />
* Lithium batteries have limited cycle life; replace when max cycles reached or after two years of operation<br />
* Keep batteries away from inflammables, explosives, and children<br />
* The listed commands assume a working Raspberry Pi environment; exact COM port mapping varies by computer<br />
* Flashing Pico2 firmware may cause the device to become unrecognized – only use the firmware provided in the package<br />
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== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Pico-UPS-A Pico UPS A - Waveshare Wiki]<br />
* Source revision: 91355<br />
* Captured: 2026-09-02T02:43:31+00:00<br />
* SHA-256: <code>2925e74347cd0a6be173e46531f47f185da0145352a1451029febf85f94f35bf</code></div>JWTechPublisher