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Hi I have a Raspberry pi 4 which is used to drive a car for a project. Pi is powered using a hat connected through gpio ports. I am using 2 x 18650mah 3.7v for powering the car and rpi. Most of the time it shows Low voltage warning and the status lights starts to dim. Is there any way to power rpi without using the 5v pin in gpio and connecting an external power supply using Usb Power Bank. Also I found out that i accidently powered the rpi from both the gpio and the usb.

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    Unfortunately, some of these power hats don't actually deliver enough power, particularly with changing loads and additional hardware connected (such as a display). Try getting a better power hat.
    – PMF
    Commented Apr 22, 2022 at 13:28
  • 5v pin in gpio ... the 5 V pin is not part of the GPIO ... only some of the pins in the header are used for GPIO
    – jsotola
    Commented Apr 22, 2022 at 15:19
  • Your question is devoid of information needed to give you any sort of a reasonable answer. Batteries in parallel or series?, how you regulate to get 5V? - you don't even get the battery rating correct: 18650mah??? Read this re your battery, do some math & edit your question. I suspect you'll have a very short drive in your car.
    – Seamus
    Commented Apr 22, 2022 at 22:42
  • The Pi4 is a poor choice for a battery powered device - it is the most power hungry model and almost certainly the processing power is not needed.
    – Milliways
    Commented Apr 23, 2022 at 2:08
  • @jsotola I am sorry i am new to rpi. When i googled i found out that rpi is having Raspberry Pi 4 GPIO Pinout has 40 pins: 26 GPIO pins, two 5V pins, two 3V3 pins, and 7 ground pins (0V). 2x5v pins and 2x3v pins so my hat is using these pins to power raspberry pi. I am not using any power source other than the batteries. Commented Apr 23, 2022 at 9:42

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The Pi requires 5V +/- 0.25 volts to operate properly. You will get the low voltage warning if the Pi has less than 4.65 volts.

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Have you tried to add a capacitor between GND and 5V close to the 5V pin? Maybe the voltage is not stable and drops on load changes.

If you want to power the Pi and the HAT seperately, the easiest way would be to just cut-off the 5V and 3.3V pins (but NOT the GND pins) on the pin header of the raspberry pi. This should work, but I have never done this myself.

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