Battery electric shutdown and restart.

Hi everybody I am improving my robot ( https://www.instructables.com/id/Blu-Media-Robot/) with a 12v battery I made a switch panel to turn on off the arduino board and the raspberry pi . If I turn on everything in same it s ok . My question are: Why if I am using my raspberry and I turn on my arduino board ; why the rpi reboot? (battery trouble) And can I fix it ? Thanks for your time

Asked by LaurentP30 1 day ago