Trickle charging Taycan 12v battery through OBDII port

[Gino]

Taycan has a Lithium battery. 13.3 volts is normal for them.

Thanks, I didn’t know that. So is there a voltage showing on the dash which would begin to concern you below 13.3 volts?

Porsche has recommended 40-50% charge for long-term storage or trips to Service. We have left our 2020 TS set disconnected for days down to 40% with no issues. Connecting via phone app more than once a day might make you feel better but is not necessary.

From batteryworld.com.au :
"A 12v lithium LiFePO4 battery fully charged to 100% will hold voltage around 13.3-13.4v. Its lead acid equivalent will be approximately 12.6-12.7v."

All our Porsche vehicles with LiFePO4 batteries are always >13 volts and charge near 13.8v.

We drive our 2020 TS like any other Porsche, do not baby it, do not always connect it, but always lock it when parked, even in our garage, and we make sure the keys are far from the car. Works like a dream for trouble-free driving.

Great info to get. Thanks. Still getting to know our Taycan but we’re becoming more comfortable knowing what to do as well as what not to do…

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[Watchesandburgers]

Cutting through all the unnecessary this-and-that. Like I said before, set the Timer and Profile correctly and the car will charge to a max of 85% (or whatever you set it to). Leave it plugged into 110v (L1 / regular household plug) and that’s fine for long term no-driving situations. Enjoy!

 

[Vercingetorix]

Thanks, I didn’t know that. So is there a voltage showing on the dash which would begin to concern you below 13.3 volts?

 

[Gino]

Cutting through all the unnecessary this-and-that. Like I said before, set the Timer and Profile correctly and the car will charge to a max of 85% (or whatever you set it to). Leave it plugged into 110v (L1 / regular household plug) and that’s fine for long term no-driving situations. Enjoy!

Thanks!

Perfect! Thanks

 

[Kev946]

I use a CTEK Lithium charger and I believe it cycles anyway so isn't always charging I think? I leave it plugged in all the time.

 

[Gino]

Thanks!

Perfect! Thanks

I was just looking at the 12v battery in my Taycan which says it’s nominal voltage is 13.2V but by the chart you attached shows the battery is at only 70% charge rather than 100% at 13.2V.
My Taycan hasn’t shown greater than 13.5V since I’ve owned it the last 9 months. I haven’t seen it go below 13.3V so it’s appears not be fully charged yet still above the 13.2V nominal rating of the battery.
Does anyone ever see voltage readings 13.6V or greater which would be 100% fully charged?
I’m wondering how long these batteries last? Does the voltage reading drop over time as the battery degrades?
I’m assuming the 12V battery is not a warranty item so do these batteries require replacement every 5-7 years like a typical lead acid or AGM battery does?
I’ve heard on this forum that it costs over $1000 to replace at the dealer.
Not sure if anyone has replaced the 12V battery themselves. I’ve used the OBDII port to attach a 12V battery so you don’t lose any of the vehicle programming in my other ICE vehicles, such as the radio codes on my 2000 Boxster. Every time I replaced a battery without attaching a 12V battery to the OBDII port my radio would be locked and I had to take it to the dealer to get it unlocked. The dealer showed me how to avoid this by maintaining a 12V connection during the battery replacement.
I’m trying to understand when (how long) I can expect for my battery to last so I can replace it before it fails. Hopefully there will be some indication on the charge reading over time so I can avoid a dead 12V battery since it will likely happen to my wife at a very inconvenient time & place.
There are no Taycan batteries older than 5 years so I’m assuming they should last at least 5 years if properly maintained. Does anyone have any idea how long these batteries should last? Hopefully there’s a way to test them to know when they’re at the end of their useful life and should be replaced.

 

[Gino]

I was just looking at the 12v battery in my Taycan which says it’s nominal voltage is 13.2V but by the chart you attached shows the battery is at only 70% charge rather than 100% at 13.2V.
My Taycan hasn’t shown greater than 13.5V since I’ve owned it the last 9 months. I haven’t seen it go below 13.3V so it’s appears not be fully charged yet still above the 13.2V nominal rating of the battery.
Does anyone ever see voltage readings 13.6V or greater which would be 100% fully charged?
I’m wondering how long these batteries last? Does the voltage reading drop over time as the battery degrades?
I’m assuming the 12V battery is not a warranty item so do these batteries require replacement every 5-7 years like a typical lead acid or AGM battery does?
I’ve heard on this forum that it costs over $1000 to replace at the dealer.
Not sure if anyone has replaced the 12V battery themselves. I’ve used the OBDII port to attach a 12V battery so you don’t lose any of the vehicle programming in my other ICE vehicles, such as the radio codes on my 2000 Boxster. Every time I replaced a battery without attaching a 12V battery to the OBDII port my radio would be locked and I had to take it to the dealer to get it unlocked. The dealer showed me how to avoid this by maintaining a 12V connection during the battery replacement.
I’m trying to understand when (how long) I can expect for my battery to last so I can replace it before it fails. Hopefully there will be some indication on the charge reading over time so I can avoid a dead 12V battery since it will likely happen to my wife at a very inconvenient time & place.
There are no Taycan batteries older than 5 years so I’m assuming they should last at least 5 years if properly maintained. Does anyone have any idea how long these batteries should last? Hopefully there’s a way to test them to know when they’re at the end of their useful life and should be replaced.

From what I can find out about the lifetime of a 12v battery is similar to a lead-acid or AGM battery but you need to avoid draining any battery until it’s dead. Once this happens the lifetime is dramatically reduced. The experts state these batteries should last at least 5 years or 2000 charge cycles so if I never leave the main battery at less than 50% SOC it should always be properly maintained. The big question is when will I know it’s time to replace it on a preventative maintenance schedule?

 

[Graluy]

Thanks! I had set my home & away settings to 85% it didn’t work when it was at the Porsche dealer. They always gave it back to me at 100% even though the setting was at 85%.
I’m going to try to use the vehicle timer again to stop at 85% to see if that works. If it does then I’m home free…

Gino, this all seems irrelevant to me. You shouldn't need to purchase a mechanical timer or any kind of ODBC charger. This can all be accomplished in-car using the Timer and Profile settings. Here's my suggestion.

1. For the Timer, which you should already have set, it should look like this: Ready for departure at 7:00 AM (or similar). Every day of the week selected. Target charging 85%. This is the maximum charge value for any L1/L2 charge session.
2. For the Profile, you should already have one called "Home". It should be set with your home address and a minimum charge value of 25%. You can increase this to 50% if you want. Set the Preferred Charge Period to overnight, 10:00 PM - 4:00 AM or similar.

This will set the car to immediately charge up to the minimum number (25% or 50%) between 10 PM - 4 AM. From there, it will continue to charge up to 85% each night between those hours. When it reaches 85% it will only charge when necessary. The car may only lose 1-2 miles of range a day, so the car will stay at 85%. This is equivalent to a trickle charger for an ICE car.

From an 11-year Tesla owner, believe me when I say, a plugged in EV is a happy EV. Enjoy!

Good morning

this is a good way and if you have 220 240 V and the porche charging connect you can also set up the intensity delivered to reduce it if you do not want to charge too quickly
In France (Bordeaux) I have set up to 24 A to also avoid too much heat
Have a Nice day

 

[Gino]

Good morning

this is a good way and if you have 220 240 V and the porche charging connect you can also set up the intensity delivered to reduce it if you do not want to charge too quickly
In France (Bordeaux) I have set up to 24 A to also avoid too much heat
Have a Nice day

Thanks!

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