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991.1 Battery Replacement DIY

 
Old 01-02-2018, 07:59 PM
  #46  
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Originally Posted by daberlin View Post

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.
David - Thanks for the follow up. That was awesome. I'm sure you helped a lot of us in the forum.
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Old 01-02-2018, 08:15 PM
  #47  
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Originally Posted by subshooter View Post
David - Thanks for the follow up. That was awesome. I'm sure you helped a lot of us in the forum.
+991

Great information here and thanks for the followup.
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Old 01-02-2018, 09:00 PM
  #48  
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The urban legend regarding initializing the new battery to the car is likely rooted in the owners manual which states “After a new battery is installed, it must be initialized in the control unit.” (Page 284 of the 2016 owners manual).
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Old 01-02-2018, 09:00 PM
  #49  
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BTW nice find on Batteries Plus..... Never really put them on my radar before seeing your post.

After a bit of searching last night using the local auto parts web sites...... Batteries Plus has a pretty good deal going on the AGM battery for our cars.

Most others have 24-36 month warranties where Batteries Plus has a 48 mo.
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Old 01-02-2018, 11:40 PM
  #50  
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Originally Posted by justabout View Post
The urban legend regarding initializing the new battery to the car is likely rooted in the owners manual which states “After a new battery is installed, it must be initialized in the control unit.” (Page 284 of the 2016 owners manual).
Don't know what to tell ya brudda. Went straight to a dealer today who sells a ton of very high end Porsche's to ask the very same question. I wouldn't think they'd steer me wrong. That said, I'm not suggesting at all you are incorrect or that I'm unable or unwilling to read the manual. I'm just relaying that at least THIS Porsche dealer isn't initializing control units upon battery installations.
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Old 01-03-2018, 09:24 AM
  #51  
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Originally Posted by Noah Fect View Post
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...
Lithium ion batteries are prone to catching fire when they overheat or if the cells are compromised by vibrations or impact. So, I would expect part of the high price to go into addressing these issues. And a portion of the price probably goes into paying for liability insurance for the inevitable fire or two. Personally, I wouldn’t bother with saving weight by using a lithium ion battery. Too high a price for negligible gain, plus the fire risk. A plain AGM battery is fine by me. Nice write-up.
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Old 01-03-2018, 10:23 AM
  #52  
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Originally Posted by daberlin View Post
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.
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.
Again, great post, David. This will help a ton of late model (911, GT3, Boxster and Cayman) Porsche owners in the years to come.

I really like the Interstate MT-49 H8 recommendation. At 900 CCA it's the highest I've seen, and accorning to this like, only weights 48 pounds, about 2 more than the factory OE battery, and about 10 pounds LESS than the Duracell.

https://www.interstatebatteries.com/products/mt-49/h8
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Old 01-03-2018, 11:43 AM
  #53  
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Great info here and just in time. My 2013 C2 needs a new battery and I just got a quote from a Porsche dealer in Toronto for 545 CAD & 1 hr install 165 CAD = 710 CAD + tax = 800 CAD!!!! ���� Great to hear I don't have to get an original one.

Also the oil change is 460 CAD plus tax. I don't mind spending a bit extra but those are hefty surcharges.


Happy 2018 everyone!
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Old 01-03-2018, 11:43 AM
  #54  
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I've no desire to be a contrarian but per the factory service manual "After replacing the battery, the serial number and part number as well as the battery size and manufacturer must be entered using the PIWIS Tester under:Gateway/Maintenance/repairs/Change battery .The battery size and battery manufacturer must also be entered when changing the battery."

Now my local dealer also said no coding was needed...but I wonder if they're just uninformed?

Cheers,
NF
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Old 01-03-2018, 11:47 AM
  #55  
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Originally Posted by justabout View Post
The urban legend regarding initializing the new battery to the car is likely rooted in the owners manual which states “After a new battery is installed, it must be initialized in the control unit.” (Page 284 of the 2016 owners manual).
That is interesting. I just looked at my 2014 Boxster and 2018 C4 manuals online and it says the same thing.
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Old 01-03-2018, 12:54 PM
  #56  
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Originally Posted by daberlin View Post
Don't know what to tell ya brudda. Went straight to a dealer today who sells a ton of very high end Porsche's to ask the very same question. I wouldn't think they'd steer me wrong. That said, I'm not suggesting at all you are incorrect or that I'm unable or unwilling to read the manual. I'm just relaying that at least THIS Porsche dealer isn't initializing control units upon battery installations.
I will tend to side with the service folks on this but it does leave one wondering.
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Old 01-03-2018, 01:13 PM
  #57  
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Well if the head of the service techs says no I am sure they and others are not doing it regardless of what the manual says.

Head Tech: "Hey Wilhem, the customer wants you to code that new battery you are putting in for him."
Wilhem: "Wha . . . .???"
Head Tech: "Yeah exactly, hahahaha."
Wilhem: "Yeah, exactly, hahahahaha"
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Old 01-04-2018, 01:58 AM
  #58  
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There's no telling why they want this to be done, but it is in the manual.
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Old 01-04-2018, 09:17 AM
  #59  
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My service department says the Porsche procedure is to reset the computer after new battery installation, just as the manual states. I was just in for an annual service last Wednesday and asked them.
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Old 01-04-2018, 03:02 PM
  #60  
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Originally Posted by LexVan View Post
Again, great post, David. This will help a ton of late model (911, GT3, Boxster and Cayman) Porsche owners in the years to come.

I really like the Interstate MT-49 H8 recommendation. At 900 CCA it's the highest I've seen, and accorning to this like, only weights 48 pounds, about 2 more than the factory OE battery, and about 10 pounds LESS than the Duracell.

https://www.interstatebatteries.com/products/mt-49/h8

Lex, not sure if the MT-49 H8 is AGM battery, as site does not mention it specifically. The MT5-49, however, is designated as an AGM battery, rated 900 CCA and weighs 58.8 lbs.
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