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992 Battery issues and the Porsche “Gotcha”

15911 Views 72 Replies 16 Participants Last post by Aircooled, 13 d ago

chcumo63

Discussion Starter · Mar 1, 2022

Hi everyone,

I want to alert all 992 owners (possibly earlier models as well) to an issue I ran into recently. I received my 992 C2S in January of 2021. From then until December 27th of 2021, I put a little over 2700 miles on it. It is kept in a garage and is lovingly cared for. This winter, we are in Florida (home is Philly), and since the car arrived here in early January, I’ve put 800 miles on it. It’s great to be able to drive it in the sun and warm weather.

However, a couple of weeks ago, I went to the gym and was there for about 90 minutes. I then went to the local DIY hand wash car wash to wash and dry the car. From their I stopped at the gas station to fill up. Once the car was full, I went to start it and while the dash lit up (not the PCM screen), the car did not start. It didn’t even turn over. It was DOA. I called my dealer in Philly and they walked me through a couple of things to try and still nothing. I then called Porsche assistance and had the car towed to the local Porsche dealer here in SW Florida. The service associate who received my car called and asked why I had the car towed in because it started up with no issues when she tried. The tow guys confirmed that it was dead when they picked it up from me. She decided to keep the car and try to figure out what was going on. After a week of waiting, I received a text with a link to receive and estimate of the work needed. The estimate was for north of $1,300.00 for a replacement battery and labor. As you can imagine, I was not amused. The dealer explained that Porsche “requires” at least 6000 miles to be driven in a 12 month period in order not to void the battery warranty. I was never informed of this by my dealer in Philly, nor was I told that buying a battery maintainer would avoid this issue completely.

I made both dealers talk to each other to figure out who was going to pay for this work as I certainly was not. At the end of the day, the battery charged up completely and two of the other metrics on the battery were above levels that would indicate the need to replace the battery. My dealer in Philly is receiving the car directly when I ship it back home at the end of March and will do their own set of diagnostic tests to see if replacing the battery is warranted. In the meantime I did purchase a CTek maintainer to use while I’m here to avoid another stranding by my car.

I’m curious if anyone else has run into this issue?

I love the car and my wife owns a Macan S so we’re certainly Porsche people, but this felt greasy and cheap and not what I’d expect from Porsche. I have not called Porsche customer support directly, but plan to do so before I leave for home.

So, if you don’t put a lot of miles on your 992, be aware that this issue may arise.

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KM992

· #61 · 2 mo ago

LessKrazy1 said:
Mine does not have RAS and I have the lithium one.

That makes us lighter and much faster that our southern neighbours. 😜

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BobbyG

· #62 · 2 mo ago

KM992 said:
That makes us lighter and much faster that our southern neighbours. 😜

There ya go! 😆

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CH61

· #63 · 2 mo ago

KM992 said:
That makes us lighter and much faster that our southern neighbours. 😜

We also charge faster and have an increased longevity which should bring us comfortably to our retirement homes! 🤪

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CH61

· #64 · 2 mo ago

CH61 said:
We also charge faster and have an increased longevity which should bring us comfortably to our retirement homes! 🤪

Apparently, it can also withstand extremely low temps. Made for Canadians! 😉

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KM992

· #65 · 2 mo ago

CH61 said:
Apparently, it can also withstand extremely low temps. Made for Canadians! 😉

Lol. My winter storage facility will be heated, as is yours.

I’ll feel a bit of shame parking it for the winter because it‘s more than capable in snow, but the rocks and salt would give me serious anxiety.

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LessKrazy1

· #66 · 2 mo ago

I will let you know later on tonight how mine did on a trickle for the past 4 months. Will be taking it for a spin tomorrow even though it will only be couple degrees above freezing point.

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BobbyG

· #67 · 2 mo ago

LessKrazy1 said:
I will let you know later on tonight how mine did on a trickle for the past 4 months. Will be taking it for a spin tomorrow even though it will only be couple degrees above freezing point.

In the 70’s here today but bad rain storms so perfect time for my monthly boost/wax and a premium cigar!

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CH61

· #68 · 2 mo ago

LessKrazy1 said:
I will let you know later on tonight how mine did on a trickle for the past 4 months. Will be taking it for a spin tomorrow even though it will only be couple degrees above freezing point.

It’ll be sunny at least. 😅 I’m also curious to see if all goes well. Never had any problems in the past (Boxsters, Z4).

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Aircooled

· #69 · 14 d ago

Any issues leaving the trunk open while on the trickle charger? I have searched on a few different forums and not gotten a definite answer. I wired mine on my C2 directly to the battery. Not one of the auxiliary posts, but directly to each battery terminal. It’s great, but I’m getting tired of getting on the ground to plug it in every time. I have a 992 GTS coming in next month and I plan to hardwire it but to leave the pigtail in the trunk compartment. My plan is to leave the trunk open and just plug it in. I noticed the trunk light turns off after a while, so I am assuming it should be safe.

I did not have great luck with the Porsche lithium-ion charger. Even hardwired to the battery it would shut off after a few days. I’ve had a C-tek Li charger on it for over a month and zero issues. It works like a champ. I then put the Porsche Li one on an AGM battery on my 86 Targa and it’s worked perfect 🤷‍♂️

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CH61

· #70 · 14 d ago

Aircooled said:
Any issues leaving the trunk open while on the trickle charger? I have searched on a few different forums and not gotten a definite answer. I wired mine on my C2 directly to the battery. Not one of the auxiliary posts, but directly to each battery terminal. It’s great, but I’m getting tired of getting on the ground to plug it in every time. I have a 992 GTS coming in next month and I plan to hardwire it but to leave the pigtail in the trunk compartment. My plan is to leave the trunk open and just plug it in. I noticed the trunk light turns off after a while, so I am assuming it should be safe.

I did not have great luck with the Porsche lithium-ion charger. Even hardwired to the battery it would shut off after a few days. I’ve had a C-tek Li charger on it for over a month and zero issues. It works like a champ. I then put the Porsche Li one on an AGM battery on my 86 Targa and it’s worked perfect 🤷‍♂️

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FYI, the facility where I store my 992 actually makes sure that the frunk stays open during the 5-6 months it stays on their trickle charger. Just in case.

I did check on my baby once in a while during that long hibernation and my app confirmed an open frunk during the whole winter.

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Aircooled

· #71 · 14 d ago

CH61 said:
FYI, the facility where I store my 992 actually makes sure that the frunk stays open during the 5-6 months it stays on their trickle charger. Just in case.

I did check on my baby once in a while during that long hibernation and my app confirmed an open frunk during the whole winter.

That is very reassuring. Thank you for the reply. I’ll report back once. It’s all set up.

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DoubleD992

· #72 · 13 d ago

Aircooled said:
Any issues leaving the trunk open while on the trickle charger? I have searched on a few different forums and not gotten a definite answer. I wired mine on my C2 directly to the battery. Not one of the auxiliary posts, but directly to each battery terminal. It’s great, but I’m getting tired of getting on the ground to plug it in every time. I have a 992 GTS coming in next month and I plan to hardwire it but to leave the pigtail in the trunk compartment. My plan is to leave the trunk open and just plug it in. I noticed the trunk light turns off after a while, so I am assuming it should be safe.

I did not have great luck with the Porsche lithium-ion charger. Even hardwired to the battery it would shut off after a few days. I’ve had a C-tek Li charger on it for over a month and zero issues. It works like a champ. I then put the Porsche Li one on an AGM battery on my 86 Targa and it’s worked perfect 🤷‍♂️

Congrats on the 992 GTS. I also migrated from the Porsche O Mat to the CTEK. Much better. Head's up. CTEK corporate support told me not to hardwire to the negative battery terminal if you have a lithium battery with BMS (RAS). Find a ground. Several have utilized the passenger shock housing. Lucky there is a positive accessory battery terminal. Just needs a M6 nut. CTEK corporate support is 1-888-880-0684 in case you want to discuss. Still need to hardwire. Running alligator clips now.

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Aircooled

· #73 · 13 d ago

DoubleD992 said:
Congrats on the 992 GTS. I also migrated from the Porsche O Mat to the CTEK. Much better. Head's up. CTEK corporate support told me not to hardwire to the negative battery terminal if you have a lithium battery with BMS (RAS). Find a ground. Several have utilized the passenger shock housing. Lucky there is a positive accessory battery terminal. Just needs a M6 nut. CTEK corporate support is 1-888-880-0684 in case you want to discuss. Still need to hardwire. Running alligator clips now.

Thank you for the tip. I’ll send you over some photos when I get mine wired up. My car supposed to arrive to the dealer in Orlando the Saturday before Father’s Day. Fingers crossed!

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