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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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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.

== Summary ==
The UPS HAT (B) is an uninterruptible power supply for the Raspberry Pi series. It provides 5 V at up to 5 A, communicates over I2C, and includes multiple battery protection circuits.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL20567 WSAL20567 – Uninterruptible Power Supply UPS HAT (B) for Raspberry Pi, 5V Output, up to 5A Current, Pogo Pins Connector]
* [https://shop.jw-tech.eu/p/WSAL20568 WSAL20568 – Uninterruptible Power Supply UPS HAT (B) for Raspberry Pi, 5V Output, up to 5A Current, Pogo Pins Connector]

== Technical overview ==
* Compatible with Raspberry Pi 3, 3B+, and 4B.
* I2C bus for real-time monitoring of battery voltage, current, power, and remaining capacity.
* Multiple protection circuits: overcharge, over-discharge, overcurrent, short-circuit, and reverse-polarity protection, plus equalizing charge feature.
* Onboard 5 V regulator capable of up to 5 A continuous output.
* 5 V USB output for powering additional boards.
* Battery warning indicators to verify correct battery connection.
* Dimensions 56 × 85 mm; mounting hole 3.0 mm.
* Supports two 2600 mAh 18650 Li batteries (not included).

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
sudo raspi-config
Choose Interfacing Options -> I2C -> yes
sudo reboot
sudo apt-get install p7zip
wget https://files.waveshare.com/upload/4/4a/UPS_HAT_B.7z
7zr x UPS_HAT_B.7z -r -o./
cd UPS_HAT_B
python3 INA219.py
</syntaxhighlight>

== Notes and version constraints ==
* Set the switch to OFF before connecting the battery to avoid shorting.
* Ensure Pogo pins are fully aligned with the pin header before turning on the power.
* On first installation, press the Boot button to activate the circuit if the board does not work.
* If the WARNING LED is on, the battery is connected in reverse – charging in this state is prohibited.
* For long-term operation, keep current below 4 A; at 5 A the unit may overheat.
* Use only the supplied charger; other power sources may cause damage due to high ripple.
* Li-ion/Li-po batteries are unstable and can cause fire or injury if improperly charged or used.
* Do not mix old and new batteries or use different brands.
* Replace batteries when they reach maximum cycle life or after two years, whichever comes first.
* Capacity reading may be inaccurate while the adapter is connected; expected full-charge voltage is 4.2 V.
* Negative current means the battery is discharging to power the Pi; positive means it is charging.
* Automatic restart after shutdown is not supported.

== Source and revision record ==
* [https://www.waveshare.com/wiki/UPS_HAT_(B) UPS HAT (B) - Waveshare Wiki]
* Source revision: 90961
* Captured: 2026-09-02T04:02:37+00:00
* SHA-256: <code>717fe32f65b4fb1b39cd1be15f3db89fb094f4cf221514f2b51169ff256d5976</code>

WSAL20567 – UPS HAT (B)/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex