DFR0494 UPS Hat not Powering Raspi 3
abelgsmith 2026-04-27 04:11:08 127 Views2 Replies So I got the DFR0494 UPS Hat for the raspberry Pi 3 to use as backup power. Got a 2400 mAh to go with it. The issue I am having is when I power it with a 5 V 2.5 A charger, it will show the blue charging light and the white battery light will blink, but it never goes up and power never reaches the Pi. All the pins line up and it won't even power just the Pi. I have activated the I2C options as well. I don't know if I'm missing something obvious, but I'm running out of ideas of what it can be.
Hey there!
You can check a few key points first:
First, confirm you are using a standard 3.7V lithium battery, and check if low battery protection is triggered based on the firmware version.
If output was cut off by low power protection, long press the function key for over 2 seconds to manually enable 5V power output.
You can also run sudo i2cdetect -y 1 to check I2C communication.
Yx Hello, so the issue is that the UPS hat does not have any power on any of the pins or power outputs. Only shows .2 V when it is plugged in my itself. The charge light will come on and the battery light will start blinking, but the power output it .2 V like I said before. I think this might just be a defective unit.
