Battery Protection Mode - Aston Martin DB 9 2013 Manual

To remove the battery conditioner first disconnect from the mains
supply, then from the vehicle socket.
11.26

Battery Protection Mode

Replace the battery as soon as possible, if the battery is not
capable of starting the engine.
Using the vehicle electrical systems, i.e. the infotainment system, with
the vehicle key at position 'I' (ignition OFF) will drain the battery
charge. Eventually the battery will drain to such a low level that it will
not start the engine.
To avoid this happening, a series of safety mechanisms shut down
nonessential electrical systems before excessive battery drain takes
place.
Frequently Asked Questions
What is the first sign of battery protection mode?
Two messages will show:
[A] : WARNING - LOW BATTERY (For 10 seconds).
[B] : LOW BATTERY
What should I do next?
Set all unnecessary electrical systems to OFF to reduce battery drain.
Start the engine to recharge the battery. Run the engine for a
reasonable length of time.