C70 Deck – how much is minimum voltage to make it work?

Hy, do you know what minimum voltage the cover needs for it to work ? From a certain voltage, this doesn’t work and it only flashes at the switch, although everything is OK with the cover and its control. Can’t you take it out ? Because it bothers me when the battery is still so good that everything works problemlessly, the car starts without problems ect, but the cover means like a little princess, no I don’t like it, it’s not enough Volt ect…. he woman didn’t jump on because of the same crap and said battery voltage was too low, although this battery was ok…. New cheap AGM in and everything goes again….doesn’t cost anything, such an AGM at these times, even in shopping…