2ndof2

Broke my ankle and haven't driven the car in about 3 1/2 weeks. Looking at another 3 or 4 weeks. I suppose I could get a trickle charger... Not sure how the battery is doing. I've kept the alarm unarmed so I figure there's very little drain on it just sitting there but of course I'm sure I'll get some expert advice here!

cdmdriver

That would be the best idea. Disconnect the battery and hook it up to an automatic trickle charger like a Battery Tender.

David in LA

airbag light comes on and ECU resets

ltc

Don't disconnect it, no need to.
Just buy a proper battery maintainer/trickle charger (the Porsche one for about $50 that goes in the cigarette lighter is OK) and you will be fine.
There are others available...Deltran, Schumacher, CTEK (OEM to Porsche), etc...

Also a good idea to do a quick (visual) check of the electrolyte levels in the battery as well.

ltc

Another useful tip for starting a car that has been sitting for a bit...

Pull the DME relay (or fuel pump fuse, depending on model), crank the car until full oil pressure builds up, pause a minute, repeat until full oil pressure builds up.
Re-install DME relay (or fuse) and start the car up.
Allow it to warm up for a minute and then drive off and allow it to fully warm up.