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I had a problem on my 2004 911 Targa (35K miles on it) that when the engine (or alternator) heated up enough after about 10 minutes of driving the alternator output dropped to 10v. Killed the battery while driving. The Porsche dealer had refused to believe there was a problem with the car that was causing the batteries to die until I took a picture of the voltage meter at 10v and showed it to them. The only solution was to replace the alternator. Also, as for the battery itself, I took it to a Firestone retail dealer and they installed a non-Porsche high CCA battery without any sizing problems - for $90! (The Porsche dealer was charging me $300 for a lower capacity "factory" battery.) The Firestone battery greatly improved battery life for me as I drive the car infrequently and the old OEM batteries kept dying.
I asked the quested earlier about 996 factory battery CCA and got this useful reply. Thought I would repost it for the person that just asked it again: Posted by logray on April 01, 2013 - 08:48 AM in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa) The 80 AH Moll Part number 58035 battery is Porsche Part Number 99961108020 (the last two digits vary slightly based on series) The 70 AH Moll Part number 57069 battery is Porsche Part Number 99961107020 (the last two digits vary slightly based on series) According to the Moll application list available here: http://www.moll-batt...programm_en.pdf Part number 58035 provides 640 CCA @ -18C/-0.4F Part number 57069 provides 570 CCA @ -18C/-0.4F Oh, meant to add. I replaced my factory Moll with an Interstate Mega-Tron Plus (part number MTP-48/H6) with 730 CCA and the 996 starts much stronger than with the Moll. The extra CCA was really worth it. Price of the Interstate is $150-180 depending on where you get it.
I am considering a PC1220 from Odyssey. I talked to them and that is the one they recommend for my 2002 911 Targa (See http://www.odysseybatteries.com/batteries.htm for specs) It has 680 CCA and 70 WH for total capacity. The higher CCA is a real benefit if the car is not driven every day. My problem is I only put a couple of thousand miles on the car every year and the batteries keep dying. The Odyssey is designed for vintage use and has almost no discharge if disconnected (which I plan to do with a kill switch).
Thanks Logray and JFP for the helpful responses.
Hi Loren, actually I did read through the Battery thread before I made the first post. (It is quite simple to do, search on CCA in the thread.) Perhaps you should take the time to read through the thread, too. Nowhere in it does anyone state the CCA of the factory battery. (There are references to replacement battery CCA ratings for other manufacturers than Porsche.) Since my question wasn't answered there, and since the thread had not been posted to in years, I started a new thread after reaching the reasonable conclusion that the thread is dormant. Nothing in the forum rules prohibits that. I only posted it a second time, in the Battery thread, when you asked me to. Then when I complied, you deleted it! Ha ha, Catch 22 if there ever was one. Well done. You got me. I bet you block when faster guys come up to lap you too. But the question is this, what is the CCA of a factory Porsche battery for a 2002 911 Targa? Do you know the answer to that? If you don't (and it is not 70-80 AH as you suggested), then how about letting the community here actually read my posts so if some other folks know they can help me out. Does that sound like a plan?
I thought I posted this question already once but I don't see it anywhere. Maybe I forgot to hit the "submit button." Anyway, the question is, does anyone know the CCA rating on a factory Porsche 996 battery for a 2002 911 Targa. I think the part number is P909511. Thanks.
dseuss replied to dseuss's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)Thanks Loren. But if I am reading it right, no one has posted to that thread since 2011. Anyway, reposted my question there, but no responses so far. Also, I think the CCA would be in the order of 600-750, not 70-80. It seems like Porsche would know the answer to the question, but it is not in my manual.
Does anyone know the CCA for a factory battery for a 2002 Targa? The part number is P909511 (I think). Also is it size 48?