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991.1 Battery Replacement DIY

 
Old 01-01-2018, 06:17 PM
  #31  
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Originally Posted by daberlin View Post
I'm off work for the remainder of this week. I'll call my Porsche Service Tech and see what he says. Good tip.
Please keep us informed on the results. I have heard the same thing on other car forums. I don't know if it is just a gimmic to get you to go the dealer and pay $500 for a battery replacement or if the PIWIS really needs to be used to reset the new battery.
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Old 01-01-2018, 06:27 PM
  #32  
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I was told with the GT4 to have the battery reset for the Motorsport Lithium battery if using any lithium based battery (like the Braille). Supposedly the charging system will then take it to a higher voltage then with the OEM AGM battery. Never did have that done however and I don't plan on doing it on the GTS either.
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Old 01-01-2018, 06:37 PM
  #33  
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Perhaps Durametric could be used for a reset -- if a reset is necessary.
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Old 01-01-2018, 06:55 PM
  #34  
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Originally Posted by subshooter View Post
Please keep us informed on the results. I have heard the same thing on other car forums. I don't know if it is just a gimmic to get you to go the dealer and pay $500 for a battery replacement or if the PIWIS really needs to be used to reset the new battery.
have heard different answers from different dealers - some say you need to do it, others say you don't have to bother
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Old 01-01-2018, 11:18 PM
  #35  
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Originally Posted by Porsche_nuts View Post
Over $1600 for a battery? Plus you need a special lithium charger? That's nuts. Happy New Year.
$ 130,000 for a car? My Subaru BRZ can do anything your Porsche can do for 1/5 that cost. That's nuts. Happy New Year.
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Old 01-01-2018, 11:28 PM
  #36  
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Great DIY. Thanks
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Old 01-02-2018, 12:15 AM
  #37  
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Dabrtlin, thanks for the great write up, my 2014 is on the original battery so I am sure this is coming for me soon. What prompted the replacement?
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Old 01-02-2018, 12:39 AM
  #38  
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Originally Posted by The_Hunter View Post
What prompted the replacement?
Neglectful battery use on my part (drained it a few times). Also didn't start using a tender until last year. Was taking car longer and longer to turn over ignition start. Had similar age/battery decline in my 997.2 and that battery left me high and dry inconveniently. So, it was probably about 3-6 months early, but figured I'd get it over with now.
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Old 01-02-2018, 07:56 AM
  #39  
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Originally Posted by drcollie View Post
$ 130,000 for a car? My Subaru BRZ can do anything your Porsche can do for 1/5 that cost. That's nuts. Happy New Year.
Let me know how you like your $1600+ battery and how the weight and added HP improves the handling and performance of your Porsche.

Maybe you should get one for your BRZ too.
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Old 01-02-2018, 05:55 PM
  #40  
Noah Fect
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Originally Posted by Porsche_nuts View Post
Let me know how you like your $1600+ battery and how the weight and added HP improves the handling and performance of your Porsche.

Maybe you should get one for your BRZ too.
News flash: people around here tend to appreciate something a little nicer than what's ordinarily considered good enough.

That being said, I wonder what's inside those Braille batteries. Surely they aren't actually fabricating their own cells? I'd be hesitant to pay $1600 (or $2600, for the next step up) for a box full of generic 18650s. At the same time, why doesn't someone offer exactly that? Replacing a car battery could be about as simple as changing the batteries in a flashlight.

Emergency starter packs already work this way, so you'd think someone would extend the concept to the car battery itself...
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Old 01-02-2018, 06:24 PM
  #41  
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Originally Posted by subshooter View Post
Please keep us informed on the results. I have heard the same thing on other car forums. I don't know if it is just a gimmic to get you to go the dealer and pay $500 for a battery replacement or if the PIWIS really needs to be used to reset the new battery.
Just came back from Porsche Auto Gallery in Woodland Hills, California. SWEET new White Carrera Targa 4 GTS in the showroom. Lovely, but I digress...

Sat down and chatted with Don Sucich, the AG Service Manager whom I've known for more than 8 years and I'd consider a reliable and trustworthy Porsche service rep. It was a slow afternoon at AG, so my timing was good.

1. AG sells the Interstate MT-49 H8 for the 991 and it comes with 900 CCAs and is a 24 month free replacement warranty battery.
2. Don said he considers the Interstate battery a robust and reliable maintenance free battery for our cars, far better than the battery delivered when the car was sold new (which they do not sell), and says it's a tad under $200, plus about $100 to install. So, with tax, it's about $100 more than I paid. Sounds quite reasonable.
3. I then asked him about their replacement procedure and associated car memory. He said there is NOTHING in PIWIS or any other unique procedure they use with a battery replacement. He said there is no intelligence that the car takes stock of as the battery ages. He replied (when I relayed what was discussed online about this topic) that additional battery service requirements that a Porshe dealer might perform is complete hog wash/urban legend probably started by someone with an axe to grind. His words, not mine.
4. I asked him about using a battery tender and he said that was just fine, but often if the replacement is done quickly enough, you can swap batteries and lose no memory settings even without a tender.

I would consider this some pretty reliable ground truth info.

Regards, David
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Old 01-02-2018, 06:31 PM
  #42  
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^Is the Interstate mentioned above the larger sized you used? That's a ton of CCA at 900. Heck, my huge Ford SUV has 850 with its upgraded battery over factory OE (740).
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Old 01-02-2018, 06:33 PM
  #43  
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Originally Posted by LexVan View Post
^Is the Interstate mentioned above the larger sized you used? That's a ton of CCA at 900. Heck, my huge Ford SUV has 850 with its upgraded battery over factory OE (740).
The Duracell I purchased with a 48 month free replacement warranty has 850 CCAs. Interestingly, looking at the photo of the Interstate battery on Interstate's website (terrible website btw), this 900 CCA battery is also a monster of a battery size. Probably similar weight to the one I bought.
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Old 01-02-2018, 06:37 PM
  #44  
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Originally Posted by daberlin View Post
4. I asked him about using a battery tender and he said that was just fine, but often if the replacement is done quickly enough, you can swap batteries and lose no memory settings even without a tender.
That has been my experience as well, I only lost windows memory position which takes all or a few window button clicks to reset !! I've now had that new battery for a year, never had it "coded" by a dealer, and nothing's different... I do notice that even with a new battery, this is a car that will drain the crap out of a battery when not used...Best left on a tender whenever possible.. I'm faffing up a permanent quick connection above the trunk lid so I don't need to leave something open when maintaining - it'll need to waterproofing or a little hole in the plastic cover but I want to use the CTEK pigtails there for ease of connection...
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Old 01-02-2018, 07:08 PM
  #45  
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Great thread. I am doing this in the spring!
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