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I had to get a new battery for my 03 Boxster a couple of weeks ago. Got the Autozone 48 maintenance free one.
I jump started the old battery with a 2 amp trickle charger-overnight charge.
I couldn't start it the next day, but a jump start guy from porsche came over and got it started without actually using his jump starter, so I think you can get it charged up enough with a trickle charge, if you charge long enough. I recharged my old 911SC with a 1 amp trickle charger for 48 hrs, and it started right up.
As for grounding, I had no problem attaching trickle charger lead to the negative ground bolt next to the battery on Boxster. The trickle charger read "charging OK"
after attaching leads--with battery in car.
Batteries are cheap, and it's best to get a new one if your 3 yo battery loses its charge on a cold morning after not running for 5 days.
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