I just purchased a Porsche battery maintainer (not the newer dual mode version) for my 2008 Carrera S. I installed the battery maintainer in the cigarette lighter per instructions and set the car alarm. I went out to start the car after about a week of non use and the car had gone into sleep mode (but started). I thought by using the battery maintainer it would keep the car from going into sleep mode. Is this normal, or do you think the battery maintainer is faulty? Thanks!

 

maintainer or not, car will go into sleep mode - so it's normal. Doesn't mean maintainer might not be faulty though so check the lights on it to make sure it's working properly.

 

Thanks, will do.

 

Keep an eye on the water level in the battery. The Porsche battery is not a sealed unit. A sticker covers over the top of the battery fill plugs. You will need to add distilled water a couple of times a year.

 

I do not think that is normal. During the winter I mothball the Carrera for five months, and I also use the Porsche battery maintainer (though mine is dual-mode) plugged into the cigarette lighter. Once a month I go out and start the car and move it a few inches, and I have never had the car go into "sleep mode". I had no idea there even was such a thing.

 

See attachment from the owner's manual:

 

Thanks!

 

whats sleep mode?

 

see post #6 above... or RTFM

 

If anyone is shopping for a battery tender do Yourself a favor and buy a CTEK branded unit and skip the identical, but X3 as expensive, Porsche branded model.

 

+1 ctek

 

What year P-car does this sleep mode work on 05 06 so on

 

Should be in your owner's manual.