Panamera The 4-dour coupe by Porsche

Battery issue

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Old 02-03-2021 | 09:59 AM
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Battery issue

I was detailing the interior of my car the other day and over an hour or so with doors open and it managed to run the battery down to a point where it would not start the car. This is the second time in the last year that this has happened. The car always starts otherwise, even if it sits for 10 days when I'm on vacation. I called AAA and the driver/technician jumped the car, it started immediately, he then had me turn it off and he hooked up his diagnostic dongle and asked me to restart it without a jump which I did and it stated just fine. His diagnostic said everything was good but the cranking power was down to 52% which he said would be remedied if I either ran it at 3000 rpm for 15 minutes or took it for a 30 minute drive. I did the latter and it started fine when I got back and the voltage was 12.2 at the terminals, the car indicated 14.4v while on the drive. The battery is 6 years old so I'm contemplating a new one. So...do any of you have advise on what brand and model number to get? I don't want to spend the money Porsche wants for one, although I do know from reading through the forum that the Audi/VW battery 00915105CE is a direct replacement so there's always that. Also, when replacing the battery others had said that they connect a battery tender to the car so as to not lose the cars settings. Where do you connect it? to the access posts under the hood? I would think they would be in the way at the terminals while you were working in there and once the battery is disconnected, doesn't that interrupt the circuit making the tender connection moot? Thanks in advance for your inputs.
 
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Old 02-03-2021 | 11:36 AM
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I got a replacement from Walmart. Used a Foxwell tool to program the replacement with part #, and serial # with one digit changed. I plug my charger/maintainer to the jump points under the hood. Car told me when the battery was bad, but still started. I guess you could wait until then as an option, or possibly buy one of those Lithium jump packs in case of no start.
 
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Old 02-03-2021 | 12:42 PM
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14.4 is the charging volts. It's the reading of the alternator - not what the battery is doing. 6 years is long-in-the-tooth for a battery. Normal lifespan is 5-7 years. I got my replacement AGM battery at Autozone and coded it to the car myself. Easy peasy and way cheaper than the dealer. I was not overly concerned about losing my settings, but you can connect a trickle-charger to the underhood posts.
 
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Old 02-03-2021 | 01:16 PM
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Yes, I know that 14.4V is the charging voltage, I just mentioned that to indicate that the system was charging at it's normal rate.
 
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Old 02-09-2021 | 12:14 PM
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My '17 Turbo was built 10/16 and put in service on 4/17/17. Still had the orginal battery. I do monitor charge voltage, and mine has always been above "par." Had some odd electrical glitches lately - seatbelt warning light lit when seatbelt was fastened and a false warning that the adaptive cruise control needed servicing. Both warnings disappeared after overnight parking. Took the car to my indy shop for other work. He tested the battery and found it below spec. So, I have a replacement battery now. "We'll see what happens..."

I'm a geezer who has had a lot of cars and batteries. I've come to the conclusion that it makes most sense to replace batteries at four years, whether they appear to need it or not.
 
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Old 02-09-2021 | 10:08 PM
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Originally Posted by Kirkman
My '17 Turbo was built 10/16 and put in service on 4/17/17. Still had the orginal battery. I do monitor charge voltage, and mine has always been above "par." Had some odd electrical glitches lately - seatbelt warning light lit when seatbelt was fastened and a false warning that the adaptive cruise control needed servicing. Both warnings disappeared after overnight parking. Took the car to my indy shop for other work. He tested the battery and found it below spec. So, I have a replacement battery now. "We'll see what happens..."

I'm a geezer who has had a lot of cars and batteries. I've come to the conclusion that it makes most sense to replace batteries at four years, whether they appear to need it or not.
I noticed after charging the battery with a charger the car will then proceed to drain it down to a certain level. It does not seem to keep it fully charged. If it counts any I leave the start-stop off so the engine doesn't stop at traffic lights. Oh well.

I hope the new battery gets rid of those electrical gremlins you were having, though seeing the system drain a fully charged battery some is definitely perplexing.

It's become hard to find the H8 battery on walmart.com for some strange reason. I did have to drive to a further Walmart to procure it. I found it just now by Google searching Walmart H8 AGM. But anyways here it is:

https://www.walmart.com/ip/EverStart...0-CCA/40647529
 

Last edited by jzchen; 02-09-2021 at 10:10 PM.
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Old 02-19-2021 | 07:36 AM
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I bit the bullet and bought antigravity batteries for my Porsches, I was tired of them dying when really cold and when problems arise you always have the reserve power to start the car. That and the fact they last about twice as long as a regular battery and weigh next to nothing, made up my mind.
They are stupid expensive but I think it’s cheap insurance, I also bought the Bluetooth monitor so I can check their status on my phone.

Normal batteries are fine as long as you charge them if not using for a week or so and replace every 5 years, and yes they are charged under the hood at the posts on the drivers side.
 
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Old 06-19-2021 | 10:52 AM
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Originally Posted by stealthn
I bit the bullet and bought antigravity batteries for my Porsches, I was tired of them dying when really cold and when problems arise you always have the reserve power to start the car. That and the fact they last about twice as long as a regular battery and weigh next to nothing, made up my mind.
They are stupid expensive but I think it’s cheap insurance, I also bought the Bluetooth monitor so I can check their status on my phone.
I'm always trying to prepare for another dead battery in our Panamera because the battery went bad on us all of a sudden after diligently charging it due to COVID-19 storage/low use.

Been looking at the LiFePO4 batteries available on eBay. Having had experience with one in our Prius v I have another one on order for our '04 Toyota Sienna. Been eyeing the 100-20 size as it is closest to stock if not exact fit.

I know the instructions want you to verify alternator output between 13.0 V and 15.0 V. BUT the output can drop to as low as 12.3 V from the display. This may damage LiFePO4 batteries so I was wondering how yours are holding up?

(Thank you for any insight you might share).
 
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