WSAL20567 – UPS HAT (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 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

WSAL20567 – Uninterruptible Power Supply UPS HAT (B) for Raspberry Pi, 5V Output, up to 5A Current, Pogo Pins Connector
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:

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

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

UPS HAT (B) - Waveshare Wiki
Source revision: 90961
Captured: 2026-09-02T04:02:37+00:00
SHA-256: 717fe32f65b4fb1b39cd1be15f3db89fb094f4cf221514f2b51169ff256d5976