@IanJCoo  the battery isn't "technically" a user-replaceable part and therefore wouldn't be in the regular Dell Store, which is designed for items considered user-replaceable.  However, at least in the US (and last time I tried, which was a while ago), there was a department called Dell Spare Parts.  They had their own phone number that you could call, and they would sell you just about any part you wanted, such as replacement displays, palmrests, brackets, etc.  It helped to have the exact part number, but if you want something like a battery that wouldn't typically be tough for a rep to find.  But as I said, it's been a while since I bought a part through Dell that way, and I've never done so from Australia.