Why don't motor vehicle manufacturers include a circuit that prevents a starting battery from being completely discharged?
My pickup is old, and the key can be pulled from the ignition switch in most any position. My wife pulls the key out as soon as the engine stops, which sometimes leaves the switch in the aux position, and discharges the battery to zero overnight. She has done this twice, which considerably shortens the life of the battery.
It seems that it would be easy (for the manufacturer) to include a circuit which prevents the battery from being discharged below a certain voltage (maybe with a manual override.)
Is there a technical reason why they don't do this, or is it a cost issue, or have they not thought of it?
My pickup is old, and the key can be pulled from the ignition switch in most any position. My wife pulls the key out as soon as the engine stops, which sometimes leaves the switch in the aux position, and discharges the battery to zero overnight. She has done this twice, which considerably shortens the life of the battery.
It seems that it would be easy (for the manufacturer) to include a circuit which prevents the battery from being discharged below a certain voltage (maybe with a manual override.)
Is there a technical reason why they don't do this, or is it a cost issue, or have they not thought of it?