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Fit a Porsche one. Only about £10 more usually.
If you want the battery to last longer leave the car unlocked, but typically 3 weeks is about as much as you'll get.
Lots of folk fit a simple switch on the -ve that they flick if they're parking up for a while.
Or you could go retro: https://www.demon-tweeks.co.uk/motorsport/battery-isolators-master-switches/bosch-battery-cut-off-switch-historic-porsche-type
Hefty
lynx
Who knows anything about batteries?
Euro Car Parts gives me a choice of models, one of them being the Bosch S5 100 - is this a decent choice for the 911 or should I look at a different model?