With [Simon]’s project, a PIC MCU was used to provide a supervisor for the UPS HAT. It also bypasses the HAT’s control over whether the Raspberry Pi gets power or not. The results did however ...

One of the first Pi 400 HATs we’ve seen comes from [Patrick Van Oosterwijck], who has made a very neat 18650-based UPS add-on that is intended to eventually fit in the back of the machine in a ...

Power is via a Waveshare UPS HAT which has two 18650 type cells providing 43,400mAh of capacity (2 x 21,700) and a steady 5V to the GPIO of the Raspberry Pi 4. In this particular build ...