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In a mild climate like the OP has, there is no advantage to an oversize battery.
Hence the choice made by Porsche. An oversize battery is just more expensive and more weight - two things an engineer tries to avoid.It is different in a cold climate - hence the space for a larger battery.
For local reference a 700cca battery(regular size/capacity for a Boxster) easily starts my 6 Liter Cummins turbo diesel on the coldest days in S.California. It uses the same size as the Boxster. And that is one heluva lot more compression and mass to rotate and power glow plugs and a pre-heater - compared to an M96
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