WSAL18160 – UPS HAT/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 HAT is an uninterruptible power supply (UPS) for the Raspberry Pi family. It uses the standard 40-pin GPIO header, communicates over I2C, and provides a stable 5 V output with up to 2.5 A continuous current. Two 3.7 V 18650 batteries (not included) allow operation without mains power.

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Technical overview

Interface: standard Raspberry Pi 40-pin GPIO expansion header; fits common Pi boards.
Communication: I2C bus for real-time monitoring of battery voltage, current, power, and remaining capacity.
Protection circuits: overcharge/discharge protection, overcurrent protection, short-circuit protection, reverse-polarity protection, plus equalizing charge feature.
Voltage regulator: onboard 5 V regulator with up to 2.5 A continuous output current.
USB output: separate 5 V USB port for powering other boards or devices.
Indicators: LEDs indicate correct battery connection; warning LED lights up if polarity is reversed.
Charger: supplied 8.4 V/2 A charger plugs into the 8.4 V charging port.
Dimensions: 56 mm × 85 mm, 3.0 mm mounting hole; total height after mounting on the Pi approx. 42.05 mm.

Commands and examples – verify before use:

sudo raspi-config
sudo reboot
sudo apt-get install p7zip
wget https://files.waveshare.com/upload/d/d9/UPS_HAT.7z
7zr x UPS_HAT.7z -r -o./UPS_HAT
cd UPS_HAT
python3 INA219.py
sudo apt-get install i2c-tools
sudo i2cdetect -y 1

Notes and version constraints

Batteries are not included – 3.7 V 18650 lithium cells must be sourced separately.
First-time setup: the board may not work until the batteries have been charged; fully charge them before first use.
Use only the supplied 8.4 V/2 A charger – other adapters can damage the board.
Negative current values mean the batteries are discharging (powering the Pi); positive values indicate charging.
The default software assumes 5200 mAh (2 × 2600 mAh cells). If you use higher-capacity cells, the program parameters must be adjusted accordingly.
Lithium batteries age and have limited cycle life; replace them when max cycles are reached or after two years of service, whichever comes first.
I2C address per source is 0x42; verify on your system as it may differ.

Source and revision record

UPS HAT - Waveshare Wiki
Source revision: 89364
Captured: 2026-09-01T03:08:28+00:00
SHA-256: 6aa38d016241c4a446e4ada7e11519bb558a0900ebbf832246dec9026d9d7fab