Maybe I didn't explain myself correctly.
Yes the caravan charger does all the fancy stuff upto the 14.4volts then down to the 13.8 volts.
Its my home charger that I was interested in, its an old Halfords one that charges at about 13 volts. And it works well, on the odd occasion when I bring the battery home to keep it charged,
Should I be buying one of these CTEK chargers. Would it be of any advantage.
Hutch, it would be an advantage in that the good smart chargers will not overcharge a battery, they will set the charge rates and time durations for optimum charging and least potential for damage, they can desulphate a battery and can in some cases recover batteries that have been severely depleted.
Some smart chargers will restart automatically following a power cut, another nice touch with the better chargers is that they constantly monitor batteyr condition and can be left attached to a battery for long periods of time without damaging the battery.
I have both Optimate and CTEK and I am very pleased with both of them, both of mine are of low amperage output and can take a long time to fully charge a deeply sulphated battery, I have on one occasion left a battery on charge for several days before it recovered (I almost gave up on said battery but it is been functioning really well since - that was over a year ago).
My Optimate has been in use for about 5 years (I maintain the motorbikes batteries with it) and the CTEK is about 1.5 years old and used a few days per month, so far so good.
Another possible advantage is that they are small and relatively light and could be used as a caravan backup charger if say going away for a long trip or going abroad.
I regularly give the car and the caravan batteries some TLC with the Optimate or the CTEK as I think they do a better job than the car or caravan charging systems with regard to optimising battery maintenance.
If you do decide to get a new smart charger then keep a hold of your existing charger as it will probably have a higher amperage output for those times that you need a quick charge.
I did have a Lidl smart charger and I was reasonably pleased with it, but it commited Hari-Kiri after 3 years.
Hope this helps.