Not got a diesel or the new facelift car but can say a few things about battery life on generic new cars....My own car is a 2016 petrol 1.5 engine, and no problem with the battery or charging.
Any car may have alternator problems or regulator problems to charge battery on the move. Thats a warranty issue or if outside warrant get it fixed. The battery itself may be duff and not efficient.
On older designed cars, batteries should last seven years, or even more.
On newer cars there has been battery drain problems with....
1...Start stop technology, which because of the far more start stops per journey, really takes it out on a battery, even a heavy duty battery designed for start stop use, and may need replacing within two years from new. My own opinion having never owning a start stop car but heard bad reports, is just never to use it, as fuel savings is minimal, and wear on car engine and battery is not worth using it. Good example 453 smart car and Range Rover Evoque, many needing replacement batteries under warranty.
2...Newer high spec cars have more electronics running while car is parked, it is called 'parasitic current draw' and the factory spec batteries may be medium Amperhour or low A/h capacity, and many makes of cars now need overnight charge to top up battery with all these electronics running. Good example is Mazda MX5 MK4 with low amperhour battery, can flatten in airport carpark while away on holiday abroad in two weeks, car dead as mutton when you get back. Solution battery charging or instant start pack or needs new higher Amperhour battery.
Over and above that you can get faults that have far more parasitic current draw on faulty electronic components during car parked, draining the battery. Bad earths is one reason for drawing current. Car should be tested for how much current being drawn during engine off and parked to see if battery is being excessively drained compared to spec .. The above Mazda MX5 MK4 for example has been found to use far too much parasitic drain if the cruise control is left on active when parked (a real bad design), so all this increase in electronics is causing weird and wonderful problems with batteries.
Good luck. Another owner might have more info for you.