Battery getting old...DIY??
Thread Starter
Racer
Joined: May 2015
Posts: 463
Likes: 171
From: Parrish Fla.
Battery getting old...DIY??
Ok my battery is starting to get old and I want to replace it myself. I don't want to go the dealer for something I can do myself. Also I posted here about part of my wiring harness being chewed by mice over winter. Well when I went to pick up my car two weeks ago, they brought it around BUT did not pull it all the way out for me. I am retired from a famous law enforcement agency and my spidey sense was high, so I walked around the car and sure enough 4 inch scratch on rear bumper. Alright it happens own up to it. Don't want to go into it now but they did fix it very well. But left a very bad taste in my mouth. They knew and were hoping I didn't notice. In a word slimey! So I'm asking which battery and where to buy it. Others have said keep a battery tender hooked up to Acc. plug and no need to reprogram. True?
Banned
Joined: Jan 2013
Posts: 26,140
Likes: 5,467
From: Chicagoland Area
That's crazy about the bumper scratch. I bet you were tempted to pull your service revolver!
Thank you for keeping us safe.
Porsche sure made an easy DIY task; of changing out your own battery, pretty complex on the 991. I've read several posts in our 991 Forum, and there are several opinions. Some say coding is required. Some say not. Some say an external power back-up is required. Some say not. Some say use an H7 battery, while others have used the larger H8. About the only consensus is to use a quality AGM type battery, like our OE battery.
Sorry. Wish I could be more helpful.
Thank you for keeping us safe. Porsche sure made an easy DIY task; of changing out your own battery, pretty complex on the 991. I've read several posts in our 991 Forum, and there are several opinions. Some say coding is required. Some say not. Some say an external power back-up is required. Some say not. Some say use an H7 battery, while others have used the larger H8. About the only consensus is to use a quality AGM type battery, like our OE battery.
Sorry. Wish I could be more helpful.
Banned
Joined: Jan 2013
Posts: 26,140
Likes: 5,467
From: Chicagoland Area
These will make it crystal clear, NOT:
https://rennlist.com/forums/991/9904...-question.html
https://rennlist.com/forums/991/9727...ry-advice.html
https://rennlist.com/forums/991/9746...g-battery.html (this may be the BEST one to read)
Happy 4th!
:https://rennlist.com/forums/991/9904...-question.html
https://rennlist.com/forums/991/9727...ry-advice.html
https://rennlist.com/forums/991/9746...g-battery.html (this may be the BEST one to read)
Happy 4th!
Thread Starter
Racer
Joined: May 2015
Posts: 463
Likes: 171
From: Parrish Fla.
Thanks Lex I do always value your opinions as well as you wit as do others on here. Always like your comments! Trying to sort it out now.
Btw way, when I went to P/U the car NONE of the console buttons worked. No PSE, No Sport Sport+ Nothing. They fixed everything but Like I said sleazy.
LOL Revolver like it...old school man...LOL
Btw way, when I went to P/U the car NONE of the console buttons worked. No PSE, No Sport Sport+ Nothing. They fixed everything but Like I said sleazy.
LOL Revolver like it...old school man...LOL
RL Community Team
Rennlist Member
Rennlist Member
Joined: Jan 2010
Posts: 6,157
Likes: 1,675
From: New York
do you want to name the sleazy dealer as I live in the area and want to avoid them
if you don't want to name publically, can you PM me
thanks
as for the battery, think Lex's post just about says it all, but I'd just buy a good battery and hook it up myself and not worry about the supposed "needed" programming
plus did insurance cover the rewiring from the mice?
if you don't want to name publically, can you PM me
thanks
as for the battery, think Lex's post just about says it all, but I'd just buy a good battery and hook it up myself and not worry about the supposed "needed" programming
plus did insurance cover the rewiring from the mice?
Rennlist Member
Joined: Nov 2015
Posts: 1,158
Likes: 175
From: Northern VA and Central FL
So how does this work?
I added the little triangular flairs to prevent buffeting in the cabin with the windows down. Unfortunately I had one of those cars that required the removal of the entire door card, which requires a battery disconnect to prevent accidental airbag deployment.
I disconnected the battery as instructed (I think it was on the ground side - but it was completely removed), performed the install, reconnected the battery, and the only thing I had to do was to reset the windows. Everything else worked, and I mean everything (key programming, PCM settings, clock, etc.).
So what's the difference between this and replacing the battery? I would expect the same results when changing the battery.
I added the little triangular flairs to prevent buffeting in the cabin with the windows down. Unfortunately I had one of those cars that required the removal of the entire door card, which requires a battery disconnect to prevent accidental airbag deployment.
I disconnected the battery as instructed (I think it was on the ground side - but it was completely removed), performed the install, reconnected the battery, and the only thing I had to do was to reset the windows. Everything else worked, and I mean everything (key programming, PCM settings, clock, etc.).
So what's the difference between this and replacing the battery? I would expect the same results when changing the battery.
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Drifting
Joined: May 2015
Posts: 3,096
Likes: 48
When I changed my battery it couldn't have been more simple. Take black plastic thing off, unplug old battery, unscrew battery retaining clip, put new battery in, screw retaining clip back in, plug battery in. Maybe 10 mins. No faults. I think I may have had to reset windows but that's easy.
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Joined: May 2013
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I agree with jabs1542......I disconnect my battery cables ALL winter when in storage ( about 5 months ) without ANY battery tenderizer that almost everyone talks about on this forum . when I am ready to take the car out in spring I just put the cables back on and start the car.....no sweat. no reprograming none of that nonsense. everything works like I had it before I stored the car . just need to reset windows.
just follow Dewinator's directions...as simple as that.
just follow Dewinator's directions...as simple as that.
Rennlist Member
Joined: Aug 2012
Posts: 8,309
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From: Pac NW
Of course, even if this is true, the cost of having a certified Porsche dealer install and code a certified Porsche battery is high enough that you'd probably come ahead if your aftermarket battery lasted only one year.
Against that you'd need to balance the fear that any electrical problems will be ineligible for warranty service if you didn't pay the dealer their baksheesh.
