blassy

So picked up my 997 last year. Battery was 2 years old. Was dumb enough to leave it while away at the cottage for 2 weeks and came home to a dead battery.
Lesson learned. Was quite a show learning how to rectify that situation.
So new battery end of last year.
My car is a 3 season fairly daily driver. Most if goes is 2 or 3 days without being driven. I do find, however, that if I leave it more than 3 days it's a pretty hard crank.
Parked it Friday morning and knowing it would be a few days, I threw the battery tender on yesterday morning (that's 48 hours) and the charge light stayed on a good 24 hours before it
showed full charge today.
I keep it in a locked garage so I never lock the car which would enable the security features so no real drain that I can think of.
Is this a me problem or an issue with these cars?

1 PGH 1

Hasn’t been my experience with my 2011. If I park it Friday and don’t drive it over the weekend, I would have no worries about it firing right up Monday morning. If I’m out of town for a week or so, I’ll throw the tender on as a precautionary measure but it would likely be ok without it.

wc11

Secure garage so I never lock it but I've left my 997.1 3 weeks without plugging it in without issue.
Btw. 1st battery lasted 7 years.

Bud Fox

Not locking the car will drain the battery

Pags993

Same here, 997.1 C2S and zero issues after 2 weeks of no use but I do lock it.

theiceman

Parasitic drain maybe ?

Turbodan

this is true, less drain when locked. my car can sit for weeks and no problem. I would check the battery and charging system

jumper5836

gps tracking will slowly discharge the battery when it's own battery needs replacing.

911 Rod

Lots of talk about this on the 996TT forum. Some cars have this problem and I personally think there is something happening there.

I can leave my car for weeks (unlocked) and it always fires up.

BIG smoke

Any Boomerrang system hidden in your car?
x2 - check for parasitic battery drain.

blassy

Taking it in next week to prepare for winter slumber. Gonna have my mechanic take a good look. No biggie putting the tender on when it’s in the garage but just seems odd. My X5 can sit for weeks and fire up and there’s a ton more electronics running in that thing. Guessing locking it to put it to sleep may help. I know the previous owner so nothing running in the background.

jumper5836

A lot of leasing and financing companies put them in. I would check for a wire tied into the fuse panel somewhere. I believe there are some battery checkers that also can detect a slow pull on the battery as when I got mine CAA detected it and I had it pulled out at a car audio shop.

JimV8

Lead acid batteries do not like to deep discharge and going below 85% discharge will reduce the life of a brand new one to maybe a year. If you don't drive a lot and can't trickle charge you might go for an AGM (absorbed glass mat) battery. Also a lead acid but the electrolyte is soaked into a mat. Same problems but a lot less problematic and will hold charge better and not as bitchy to recharge. If you want to solve the problem get a Lithium Ion battery, a lot lighter and those can drain completely and will charge back up quickly in a couple of hours. Still subject to a finite number of cycles but well beyond a lead acid. Look it up.

wc11

never happened yet

AWDGuy

same here.

I had issues before but that was due to the faulty voltage regulator, then the bad Y cable, then the bad starter, then the bad alternator....lol

but now im good. thank fawk.

Edit: I never lock my car.