Speaking of my own chinese heater. The warming of the glow plug before the burner will fire up is the biggest draw on the batteries after that the drain on batteries drops right
PS. E01 on the panel is low voltage.
I have run it for 7 hours at maximum some nights in the winter and it uses around 0.5L of diesel per hour which is something else to consider and I couldnt run it all night if I wanted too because of the fuel pump ticking away whilst being so close to the bed so I use the little fob to switch it off when in bed and if needs be I can turn it on before getting out of bed. As for noise, I have asked and nobody has complained.