It's the norm. It very much depends on your usage and driving conditions - frequent stops / short commutes in freezing cold weather are likely to wear out a battery quicker than someone driving longer stretches of road in mild temperatures year round for example - but, as I have said before, in general the factory installed battery of the LR4 seems to be engineered to give up without much of a warning, if any, a split second after your factory warranty is up.
If your vehicle is still under factory warranty, lucky you as your failed battery is covered as well, so you should seek a free replacement from the dealer (they should test the alternator as well to make sure that's not what caused the battery to fail prematurely.) A local dealer will usually install a better quality battery than the one that came with the car originally anyway - the exact OEM brand/model is not available here in the US, thankfully. If you are fresh out of warranty as most of us are, there are plenty of much better options on the market, including AGM batteries, for around $200 or so (run a search and you'll find tons of topics), and someone even posted a useful how-to battery replacement thread with photos recently on this forum.