Suggest providing a video of the problem for us to see.
What is the voltage of the battery measured when the low voltage prompt appears.
Did you fully charge the battery,? Does the Raspberry Pi also show the low voltage prompt when fully charged.
Have you fully charged the battery and then connected the PiPower to the PI4 to start it? Are you seeing any low voltage warnings?
When the battery voltage is too low, a low voltage warning will indeed appear.
If you are playing while charging, with the PiPower connected to a power source, it’s recommended to use the official 5V 3A power supply from Raspberry Pi.
Using a third-party power supply may also result in low voltage warnings.
Yes official power supply works fine. No warnings. I get 5,18V on it. When I put the pipower in between it only outputs 4,7-4,8V when fully charged. When I unplug it from AC the voltage goes to 5V.
The warnings on home assistant are when using the pipower. Afterwards is on the official supply.
I am running into the exact issue with my RPi4 running the PiPower v2. Voltage is >
5v when running off of the battery, but drops below 5v once I plug in. Tried multiple charges able to handle 3A or greater.
Nice to know I’m not the only one with this issue.
The current version of the PIPower V2 is designed this way.
The official 5V 3A power supply needs to simultaneously power the Raspberry Pi 4 and charge the battery. The total demand may require a high current, which can lead to the power supply being overloaded and the output voltage being pulled down.
Additionally, when the external power source is connected, the UPS switches from battery boost mode to passthrough mode. This process goes through many interfaces and connections, which can also cause a voltage drop.
Even if the output voltage decreases, under normal circumstances, there should not be any issues with the Raspberry Pi shutting down or rebooting.
We recommend using the official 5V 3A power supply for charging. Please check if the output voltage remains around 5V while charging and using the device simultaneously.
We also suggest using a multimeter to measure the output voltage.
Even if the output voltage is slightly above 5V, it shouldn’t affect the Raspberry Pi’s power supply or cause it to shut down or restart.