Posts crossed here - I was saying the same but more long-winded!
Is it configurable though as some preset ones are something ridiculous like 11.6v or so. I set them at 12v so that they leave some electrickery in the battery - the battery usually recovers a couple of volts after drains are stopped. I know that the ecu on the Airtronic has a low voltage cutoff of 10.5v which isn't user configurable and that is useless for saving your battery as it will be on its way to being goosed at that voltage.
In my younger years I used to sleep in the Welsh mountains in the open in winter in just an Army sleeping bag.