Agreed but the point I was trying to make is that using the seat heaters, rear window demister etc.. will not accelerate the 12v battery drain as they are feed by the traction battery.
If the hybrid is put into the ready state for approx 30min at least once a week the traction battery will recharge the 12v battery, even if the car isn't driven. Not something one can do in a 'normal' car as at idle there is insufficient surplus charge from the alternator to recharge the 12v battery that has just taken a big hit turning the ICE over!