I think that it can't be too long before an S-Type owner switches on the ignition and gets the horrific shock of seeing multiple failures all being reported at once.
The problem is that the electronics in our cars is susceptible to firmware corruption at low voltages and as a result the car will try to "fail safe" by shutting down various systems when it detects a low voltage state.
In days gone by, you'd get a warning of impending battery failure because the lights would go dim and the starter motor would make the instantly recognizable churning noise.
Not so with our cars though. The first indication is when you get the heart-stopping song and dance routine on the instrument panel.
Following advice, I adopted the following solution and offer it here as food for thought.
I tend to put my car's battery on trickle charge once a week overnight. Since I started doing so, I've never suffered the failure routine again.
Being of a generally lazy disposition though, it had to be easy
I wanted a trickle charger that would condition the battery and could remain connected without any possibility of damaging the battery or associated electronics in the car.
I chose a CTEK trickle charger following advice and a fair bit of research (I HATE to spend money and not get the best value).
CTEK's web site
Further, I wasn't keen on lifting the boot floor and messing with crocodile clips so I went for their panel socket which is a small panel fitted in the boot lining. It has a three colour flashing LED system to indicate battery condition. I've found this to be somewhat pessimistic but, rather that than the other way round. Here is a
Link
showing what I did with my setup.
I have the luck to be able to use this in a nice warm dry garage but I know of several who just plug the output lead of the CTEK in and close the boot lid outside their house and there seems to be no problem with water getting in to the boot.
No. I don't work for CTEK I'm sure there are some equally good trickle chargers made by other manufacturers but this works for me.