What is the replacement interval for the Taycan 12V battery?”

[Crom]

Has anyone actually had their Taycan 12V battery replaced, and how much did it cost?”

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[Dee]

I know it's expensive to replace (I heard ~$1200) but they should last much longer than ordinary 12V batteries.
They are relatively small and don't suffer from high current loads.
Mine is about 6 years old, is still at the right voltage (13,4V) and works flawlessly, I don't see it's constantly charging, only sporadically ((14,4V) and only for a short period.

I've heard they last over 10 years.
If they drain below a certain voltage the BMS of the battery itself kills the communication/charging and it's very difficult to get them back to life again.
Only electronic specialists can do that, Porsche doesn't and will just replace the battery.....

 

[Brombaer1971]

+1. In theory it should last very long because it should stay charged all time maintained by the HV battery. However in the past there were issues with the charging strategy so it could drain to zero when car is not used for certain longer intervals (holiday). However there was a software fix for it, so there should be no reason for it to happen anymore if your car software is not too old.

 

[Scandinavian]

I know it's expensive to replace (I heard ~$1200) but they should last much longer than ordinary 12V batteries.
They are relatively small and don't suffer from high current loads.
Mine is about 6 years old, is still at the right voltage (13,4V) and works flawlessly, I don't see it's constantly charging, only sporadically ((14,4V) and only for a short period.

I've heard they last over 10 years.
If they drain below a certain voltage the BMS of the battery itself kills the communication/charging and it's very difficult to get them back to life again.
Only electronic specialists can do that, Porsche doesn't and will just replace the battery.....

That is not quite correct. If the voltage level dips below a certain value there is a relay that opens and prevents the battery to drain to a mortal level. I don’t recall just now what the level is. In order to be able to charge the 12 volt battery again, you need to boost the voltage level a lot so the relay closes, and the battery can take charge again.. That is why you need a booster unit in the cabin as a safety measure, to be able to open the bonnet (electrical) and then close the protection relay.

Ask me how I know after a few trips away and dead 12 volt battery at airport parking.

 

[pteron]

how do you open the bonnet with the booster?

 

[Scandinavian]

In this post by @daveo4EV you can find good instructions.

Search the forum for more information if needed.

https://www.taycanforum.com/forum/t...it-dies-because-of-the-12-volt-problem….2529/

 

[Dee]

That is not quite correct. If the voltage level dips below a certain value there is a relay that opens and prevents the battery to drain to a mortal level. I don’t recall just now what the level is. In order to be able to charge the 12 volt battery again, you need to boost the voltage level a lot so the relay closes, and the battery can take charge again.. That is why you need a booster unit in the cabin as a safety measure, to be able to open the bonnet (electrical) and then close the protection relay.

Ask me how I know after a few trips away and dead 12 volt battery at airport parking.

You are talking about the BMS of the car.
I'm talking about the BMS of the battery.
It has its own BMS and if you get below a certain voltage it's impossible to charge again.
Way before that happens, the car's BMS has taken action, like you described (IF all works like it should).

 

[Scandinavian]

You are talking about the BMS of the car.
I'm talking about the BMS of the battery.
It has its own BMS and if you get below a certain voltage it's impossible to charge again.
Way before that happens, the car's BMS has taken action, like you described (IF all works like it should).

No I am talking about the switch off of the 12 volt battery that has been described in the forum in many posts. I am sure it has its own bms as well. Once the voltage of the 12 volt drops below a certain value the car is just dead. You can not open the doors by remote, but have to use the emergency key. And once in the car you can’t open the bonnet not the trunk. And you can notswitch the car into neutral to roll it either.

All Porsche assistance do is connect a portable booster to wake the 12 volt and if there is power in main battery it will charge the 12 volt. If not they need to have the booster connected to be able to roll the car.

You may well get the 12 volt battery very low so the cells do not respond to any charging, but hopefully the 12 volt battery has been isolated before that happens.

 

[Dee]

Irrelevant info:

Once the voltage of the 12 volt drops below a certain value the car is just dead. You can not open the doors by remote, but have to use the emergency key. And once in the car you can’t open the bonnet not the trunk. And you can notswitch the car into neutral to roll it either.

All Porsche assistance do is connect a portable booster to wake the 12 volt and if there is power in main battery it will charge the 12 volt. If not they need to have the booster connected to be able to roll the car.

Relevant info:

You may well get the 12 volt battery very low so the cells do not respond to any charging, but hopefully the 12 volt battery has been isolated before that happens.

Exactly my point.
We're talking about the life span of the 12V battery, not that one occasion that the 12V battery isn't charged and has been drained.

 

[StephNL]

The 12v battery is LiFePO4 based, not a standard lead-acid battery, so it’s far more expensive but should have a very long lifespan.

Keep in mind if you install any accessory that is pulling power while the car is off that the low cut off should be at 13v or above. Most dashcam hardwire kits don’t offer that option.
The Porsche dashcam has a cut off at 11v in PbAcid setting and 13.0v in LiFePo mode.

 

[Dee]

@Scandinavian, I'm referring to this post of Cris Tabuyo from CT14 garage at my Facebook group: https://www.facebook.com/share/p/1K9aPRBw94/

 

[Scandinavian]

I am sure it is good, but I do not subscribe or want to subscribe to Facebook or any other things like that.

 

[tigerbalm]

I am sure it is good, but I do not subscribe or want to subscribe to Facebook or any other things like that.

I won't even do Whatsapp (or any Meta product) and trust me, its getting harder as more and more seem to be using it. I'll continue being awkward, I guess. I see nothing wrong with iMessage and falling back to SMS/RCS when necessary.

 

[Dee]

@Scandinavian, you could've asked me to post it here instead of telling me why you don't go on social media.
No one cares.

Anyway:

Although you don't seem to be very receptive for my explanation, do you now see where I was referring to?

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