MY11 D4, second owner, coming up to 5years for me, 193,500km and on its second battery. I dont see that as being hard on batteries at all. Some on here are still on the original batteries.
Just make sure you get the right one for the job...
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Mine is on its third.MY12.
First was changed at 12 months under warranty,second lasted 4.5 yrs.
Not only do you need the correct battery,it also needs to be looked after.
That is making sure it is kept fully charged at all times.
Vehicles(D3/4),or for that matter any modern vehicle, that sits around or does small runs needs the battery charged regularly,or the life of the battery is compromised.
My Indi mentioned that 3 yrs or more for a battery in a D3/4 is above average life.
I've just replaced my OEM battery (lost a cell) with a Supercharge MF88HSS AGM VLRA battery - $325 from Moorabbin Battery Centre.
Followed the changeover procedure in the manual, no issues.
The Disco is much happier, so I'll see how it goes and update as to the lifetime (24 months warranty).