iPad Pro restarts randomly and afterwards indicates a 1% battery status

Hi my iPad Pro Wifi 12.5″ (2015) keeps restarting. And upon restart the battery indicates 1% battery status, and after 1 minute or so the indicator returns to the original state of battery. This happens randomly even when the unit is charged.

I already restored and updated the iOS and even reset it to factory settings. Could this be a battery problem? And can I have my unit replaced even if it is already out of warranty? Thanks!