What Land Rover advise and what Dealers actually do can be quite different!
Pop into your local LR Dealer and you will see nearly all the cars there with side lights on.
Open the bonnet of any of these cars and you will see that they have a supply across the battery, some use the CTEK brand or equivalent that has the 13.8v supply option. This supply must be capable of delivering 10 amps or more, my CTEK can deliver 25amps.
This is useful when you want to do a software/firmware update, for instance a map update which takes about 40 mins!
All the cars in Listers have this supply directly across the battery, it certainly doesn't seem to hurt the car as there would be a queue of just sold cars turning up with faulty electronics!
There are times when I leave my car locked and alarmed in the garage for a few weeks at a time. I always connect my CTEK charger across the battery to keep it up to scratch as the alarm electronics draw a reasonable current all the time!
By the way if you do need to replace the battery, use the Remote app to put the car into 'Service Mode' as this will stop you recieving a text and possibly a phone call asking if your car has been stolen. This only happens if you have the paid security option in Pro.
Last thing, I remember changing the battery on my Discovery 3 and needed to calibrate the windows, just a full UP and DOWN as well as the sun roof which needed a full OPEN and CLOSE to calibrate it, and of course reset the clock! Quite why this can't be set from GPS or the DAB/FM signal I have no idea.
Bear in mind that not every Evoque is sold in a country that has a dealer 30-40mins away! There are plenty in Egypt and Namibia for instance, and LR dealers are a little like hens teeth in those countries!
The electronics are reasonably robust no matter what people might think, doesn't mean they don't have issues though!!
Best
Ian