Further to the above:
"As regards the battery swap, no VIN (vehicle identification number) is eligible for upgrade in Australia, I’ve checked that with the factory. Just to elaborate why is not possible: not only a battery swap would be involved but also firmware, fuses, harnesses and drive units cannot sustain the extreme amount of energy produced by the 100Kw/h battery pack."
Straight from Head of Tesla Service, NSW.
Oh well.
Total BS. @wk057 has upgraded to a 100 kWh pack and it required nothing more than an ordinary swap. Extreme amount of energy? I assume he means power? Well, the drive unit will only pull the current it is rated for no matter how much the pack is capable of delivering.