This is the WaveshareUPS (Uninterruptible Power Supply) HAT (D) for Raspberry Pi 4 and 3/3B+, offering a stable 5V up to 4A (current output depends on the battery charge level). It's a useful solution for short-term power backup to protect against power cuts, or even for those who wish to move their project between different power supplies.
The design accepts two 21700-size Lithium-ion batteries (not included), increasing the potential capacity and run time of the UPS. It features a built-in Li-ion battery charging chip (charging via USB-C) with dynamic path control, a boost converter, and onboard monitoring for voltage, current, and power via I2C. The HAT supports simultaneous charging and discharging, and can display battery levels directly in Raspberry Pi OS via software.
The board connects via high-current pogo pins and includes onboard protection circuits for overcharge, over-discharge, overcurrent, and short circuit events. It also features LED indicators for real-time battery status and an onboard MCU to manage power detection and automatic booting. A USB-A output port provides a handy 5V output.
The board ships with an acrylic protection panel and fixings. Raspberry Pi and 21700 batteries not included.
Features
UPS HAT for Raspberry Pi 4/3B+/3
Provides 5V power output up to 4A
Connects to the underside of the Raspberry Pi via pogo pins
Supports 2x 21700 Li-ion batteries (not included)
Simultaneous charging and discharging supported
5V output via onboard boost converter
USB-C charging with Li-ion battery charging chip and path management
Real-time voltage, current, and power monitoring via I2C
Battery level display supported in Raspberry Pi OS
Onboard MCU for power detection and auto-boot
Battery protection: overcharge, over-discharge, overcurrent, short circuit
Please switch the power switch to OFF when assembling, or the board may be damaged as a result of a short circuit.
When you connect the battery first, it is necessary to charge it or press the BOOT button to activate the battery protection chip for power output
When the battery is fully charged and connected to the charging power, the output current is approximately 4A. As the battery voltage decreases, the output current will also decrease. When connected to a heavy load, if the current drops too low, there may be unstable voltage boosting, leading to restarts of the Raspberry Pi.
Safety precautions
Lithium‑ion and lithium‑polymer batteries can be hazardous if used or charged incorrectly, potentially causing fire, injury, or property damage.
Always check battery polarity before charging or discharging. Never connect the battery in reverse, and only use suitable, good‑quality chargers or charging panels.
Do not mix old and new batteries, or batteries from different manufacturers.
Ensure the battery specifications are compatible with the expansion board.
Lithium batteries have a limited service life and degrade over time. Replace batteries once they reach their rated cycle life or after two years of use, whichever comes first.
Store batteries carefully, away from flammable or explosive materials, and keep them out of reach of children.
Package Contents
1x Waveshare UPS HAT (D)
1x Acrylic protection plate
1x Screw pack
Raspberry Pi and 21700 batteries not included
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