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991.1 Battery Replacement DIY

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Old 02-13-2018, 08:02 PM
  #121  
Need4S
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Originally Posted by Sidvicious7


sdl2112 you are correct! I called again and was informed the Interstate MT5-49/H8 is the AGM battery. I was given erroneous information and I apologize for passing on wrong info. On a positive note, My auto shop is willing to apply a fully credit for the non-AGM battery (MTP-49/H8) and apply it to the AGM type Interstate AGM Battery. Please note the Interstate AGM battery are almost $double the cost!

Correct! MT5-49 H8 is the AGM. Retail is about $300. The MT-49 H8 and MTP-48 H8 are wet cells. Interstate terminology is very confusing and using their battery finder gives you only the wet cells as suggested replacements (at least it did for me).
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Old 02-13-2018, 09:04 PM
  #122  
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Originally Posted by Need4S
Correct! MT5-49 H8 is the AGM. Retail is about $300. The MT-49 H8 and MTP-48 H8 are wet cells. Interstate terminology is very confusing and using their battery finder gives you only the wet cells as suggested replacements (at least it did for me).
Yes it is. I did right this afternoon and replaced the recently purchased Interstate Battery with the “CORRECT - BATTERY” or AGM Type.

MT5-49/H8


Sticker


Installed
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Old 02-14-2018, 01:09 PM
  #123  
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I just replaced my original 5 year old battery with the Interstate MT5-48 H6. It has similar size, weight (45.6 lbs), specs of my original Porsche battery. It's also AGM.
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Old 02-14-2018, 10:15 PM
  #124  
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Step 2 - Open the Frunk and remove the top cover with the Porsche stamp on it.






does the top cover have to be put back? What’s wrong with just leaving it off? Every ounce counts. 😎
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Old 02-15-2018, 12:16 AM
  #125  
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Originally Posted by G99x.y


does the top cover have to be put back? What’s wrong with just leaving it off? Every ounce counts. ��

Heck, for that matter if you've got a Manual, skip the battery replacement all together and bump start the car.
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Old 02-15-2018, 01:43 PM
  #126  
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Good news: Interstate dealer is giving my a full refund on the MT49 towards the MTS49AGM... bad news is they are on backorder and not sure when it will be available. I had originally chose them because the nearest Batteries Plus dealer is 150 miles away. So for now my car sits...
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Old 02-15-2018, 02:42 PM
  #127  
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Originally Posted by G99x.y
Step 2 - does the top cover have to be put back? What’s wrong with just leaving it off? Every ounce counts.
You need the ballast up front. A true enthusiast will 303 it before replacing.
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Old 02-15-2018, 04:00 PM
  #128  
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Originally Posted by daberlin
Heck, for that matter if you've got a Manual, skip the battery replacement all together and bump start the car.

Ha ha ...
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Old 02-15-2018, 05:12 PM
  #129  
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Originally Posted by slingshot60
Good news: Interstate dealer is giving my a full refund on the MT49 towards the MTS49AGM... bad news is they are on backorder and not sure when it will be available. I had originally chose them because the nearest Batteries Plus dealer is 150 miles away. So for now my car sits...
Well, that is good news and bad news... more good than bad! Sorry it ended up taking you down for a while but at least you'll know the car won't risk getting acid in the wrong places.
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Old 02-15-2018, 08:30 PM
  #130  
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Originally Posted by StormRune
Well, that is good news and bad news... more good than bad! Sorry it ended up taking you down for a while but at least you'll know the car won't risk getting acid in the wrong places.
Yes, you don't want the tray to look like this!

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Old 02-16-2018, 01:01 AM
  #131  
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Originally Posted by LexVan
You need the ballast up front. A true enthusiast will 303 it before replacing.
ballast was why i wanted pdls....

"303" ?
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Old 02-16-2018, 07:39 AM
  #132  
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Originally Posted by G99x.y
"303" ?
Ohhhh Grasshopper. So much to learn.

Aerospace 303. We put that **** on everything.
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Old 02-16-2018, 12:51 PM
  #133  
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Maybe I'm missing something here.... Why is everyone going with an aftermarket battery vs. the OE one?
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Old 02-16-2018, 12:56 PM
  #134  
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Originally Posted by blepski
Maybe I'm missing something here.... Why is everyone going with an aftermarket battery vs. the OE one?
$$$. Same for less.
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Old 02-16-2018, 02:40 PM
  #135  
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Originally Posted by Jaws1
$$$. Same for less.
or is some cases, more for less
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