Can you trickle charge the 12V battery of a 2025 Macan EV if it is not going to be used for several weeks?

[castlg]

Can you trickle charge the 12v battery on a Macan 2025 EV if the car is not being used for several weeks? Or is this even necessary?

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[Awaz]

There are a couple of threads on this already. Useful to use search option!

https://www.macanevowners.com/forum...ence-ive-just-been-through.20101/#post-305301

https://www.macanevowners.com/forum...big-brother-800v-and-little-sister-12v.19983/

 

[nulled]

Had my Macan sitting idle for 3 weeks with an always on Garmin dashcam and had 1% battery drain and no issues with the v12

 

[henrus]

Here is a tech bulletin on storing a Taycan. Note the comment that you should avoid multiple or prolonged use of the My Porsche app as connecting to car remotely drains the 12v. https://static.nhtsa.gov/odi/tsbs/2022/MC-10209809-0001.pdf

 

[Awaz]

you should avoid multiple or prolonged use of the My Porsche app as connecting to car remotely drains the 12v

This is useful to know. I'm sure many who may not know, or do know but don't pay heed to it.
So, good to reiterate.

 

[MacanEVOwner]

Can you trickle charge the 12v battery on a Macan 2025 EV if the car is not being used for several weeks? Or is this even necessary?

Yes you can. Also, the 12v battery in the 2025 Macan EV is a AGM battery, not LiO. But, I suspect that if you have the “rear axle steering” option with the Macan, then it may come with a LiO battery, as it does with the 992.1.

 

[pm4s]

Yes you can. Also, the 12v battery in the 2025 Macan EV is a AGM battery, not LiO. But, I suspect that if you have the “rear axle steering” option with the Macan, then it may come with a LiO battery, as it does with the 992.1.

Still AGM, I have RWS.
If you don't trickle charge the 12v I can guarantee you will at some point return to a dead Macan

 

[MacanEVOwner]

Still AGM, I have RWS.
If you don't trickle charge the 12v I can guarantee you will at some point return to a dead Macan

Maybe, but at least on 2025, and newer Macan EV’s, when the 12v battery reaches around 11.7v, a protective system kicks in and briefly connects the 12v battery to the traction battery (with the appropriate voltage). I have proof of that using my Anti-Gravity battery monitor. I was also told this by my dealership. But most new premium EV manufacturers also do this…so this is not a surprises, and makes perfect sense.

For those that doubt this…I would invite them to get a battery monitoring system (e.g., Anti-gravity battery monitor from Amazon for about $35). Well worth the peace of mind. But you either have to artificially drain the battery, or wit until it drops to 11.7 v or lower….you will see the big brother battery help out it’s little 12v brother. It only stays connected for a few minutes…but enough to bring the 12v battery level to at least turn things on in the car.

As far as Li for Rear axle steering…It was standard on all 992.1 (and maybe 992.2) with the rear axle steering option. It was a requirement because something about the RAS system that needed a greater surge current that Li batteries could provide but standard AGM batteries could not…at least that was the case in 2022 and 2023. You can find that in the Porsche literature. FYI - also the Li 12v battery on the 992.1 was extremely expensive (over $2k to replace, just the battery)….so at the time I configured the car, I tried to get the AGM battery monitor. Porsche told me, that’s a no go.

 

[pm4s]

Maybe, but at least on 2025, and newer Macan EV’s, when the 12v battery reaches around 11.7v, a protective system kicks in and briefly connects the 12v battery to the traction battery (with the appropriate voltage). I have proof of that using my Anti-Gravity battery monitor. I was also told this by my dealership. But most new premium EV manufacturers also do this…so this is not a surprises, and makes perfect sense.

Yes same as all Macan EVs and as said it works up to a point until it doesn’t, may be 1 month, 2 months, 3 months, etc. Lots & lots of dead EVs of all brands suffered the same fate, if you don’t have time to muck about just use the trickle charger.
Charge in HV battery is irrelevant you can have 100%, once the 12v has died everything is dead. It’s the 12v that runs everything.
Every time the 12v battery wakes up the car/HV battery both get depleted as several modules need to boot, then dc-dc converter is used to charge it, at some point it gives up and you’re locked out frantically typing into your phone how do I access my xxx once the 12v battery has died…

 

[PrudentOcean]

For a 992 a Li makes sense because it doesn’t have another source of electricity that can handle a surge demand — the alternator isn’t able to do this. But the Macan EV has the traction battery that will always be available while the car is driving.

 

[MacanEVOwner]

Yes same as all Macan EVs and as said it works up to a point until it doesn’t, may be 1 month, 2 months, 3 months, etc. Lots & lots of dead EVs of all brands suffered the same fate, if you don’t have time to muck about just use the trickle charger.
Charge in HV battery is irrelevant you can have 100%, once the 12v has died everything is dead. It’s the 12v that runs everything.
Every time the 12v battery wakes up the car/HV battery both get depleted as several modules need to boot, then dc-dc converter is used to charge it, at some point it gives up and you’re locked out frantically typing into your phone how do I access my xxx once the 12v battery has died…

I travel a lot and can not trickle charge when i leave it at the airport. I have a battery monitor on my two EV’s, once it kicked into to re-charge the 12v battery when I was out of town for 3 weeks, while it was bitterly cold. It saved my butt upon my return, and have no quantitative evidence that shows the system is unreliable.

As far as the system that connects the traction battery to the 12v battery, when the voltage drops too low….are you saying that the system that controls this has a high failure rate? The other failure point is the 12v battery, itself….and I would presume that Porsche engineers have it designed that if it senses too much current draw (say, a shorted cell on the 12v battery) it disconnects to protect the traction battery / over-heating.

That said, when one, or both cars are at home, and aren’t going to be driven for weeks, yes, I put them on a trickle charger. One reason why I mentioned that the battery in the Macan is a AGM (many people on here think it’s Li)…and Li and AGM have different charging profiles/requirents.

 

[MacanEVOwner]

For a 992 a Li makes sense because it doesn’t have another source of electricity that can handle a surge demand — the alternator isn’t able to do this. But the Macan EV has the traction battery that will always be available while the car is driving.

Good point. Either way, I’m glad it does not have a 12v Li battery….because of the expense. Removal of the 12v battery, as is, is a major pain in the but. I just went through it, and just glad I didn’t have to pay for anything.

 

[jwatte]

I’m glad it does not have a 12v Li battery….because of the expense.

A 12V Li battery is only $100 more than a Pb battery at wholesale.
And it lasts much longer (life of the car, probably) and weighs less.
I'm sad to learn it doesn't have it! Whenever I replace 12V batteries in other cars, I buy a Li battery the same size online and then never have to do it again.

 

[MacanEVOwner]

A 12V Li battery is only $100 more than a Pb battery at wholesale.
And it lasts much longer (life of the car, probably) and weighs less.
I'm sad to learn it doesn't have it! Whenever I replace 12V batteries in other cars, I buy a Li battery the same size online and then never have to do it again.

Not my experience.

 

[Bustergordon]

I left my car for 6 weeks earlier this year and left it on a NOCO trickle charger. No issues with it, and I'm glad I did it. I'm gone again for 4 weeks later this year, and will probably do the same again.

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