Mk5 2.0 TDI not starting - Oil pressure warning lamp - what to do?

[parso_rex]

Scanned the car yesterday in between a coffee and home duties and found nothing but it would seem like the fuel pump (or perhaps its relay,filter) is the culprit simply because there is not much else that it could be. A quick google search of MkV GT's with fuel pump issues bring up a stack of hits so that would be the logical thing to look at. Its dead, no kick at all, no fuel for whatever reason
It was pretty dark and I had no tools with me at the time so sadly there was no way to look at fuel supply. I could log fuel usage but this is probably only looking at duty cycle so it still appears to work. Battery is fine for the moment.

[RigoX]

Finally some updates: Car is starting again. Jump started it with an external charger to get the engine going.
Looks like it was indeed to weak (while somehow still holding plenty charge). Car starting without problems for now.
But looks like I'll have to replace the battery.

I attached a picture of the battery.
Is replacing the battery a DIY job? If so, where and what to buy as a good replacement?
What specifications to look for?
BTW, based on the picture - is this still the OEM battery?

For warranty issues (not just for the battery itself), is it better to get it professionally replaced?

Thanks again for all your help!

[Transporter]

Yes, that's the OEM battery. I saw suitable battery at the Battery World for $260. Just make sure that the AH rating and CCA are the same or greater. You can replace the battery anywhere as long as it is done correctly you cannot lose your warranty. I would still ring to the dealer and get a quote, who knows you may be surprised they 're quite competetive on some spares.

[WA Euro]

RAC supply and install a battery for a charge of $20 on top of the battery or free if you are a member. Batteryworld. Anyone can supply a battery that will do the job, there's not much special about it. The more you pay, the better the battery. Ask about the warranty on it. The best batteries come with 36 month warranty.