No. It sat for weeks so I put the charger on it assuming it needed some charge. After many hours the charger was still full red and that’s when all this started.

 

The Moroso charger does have a maintainer level charge it automatically goes into built into it. Its size and cable size is the drawback to leaving it connected to the car. I see your point about the Battery Tender tho. While it works for all my other cars this Macan seems to have more drain and so it became too much of a challenge for the 1.25A charger.

 

Just as an update, Today I was able to drive the car 50mi. Before I left I tested the battery and it was showing 12.22 volts after sitting all nite. After the drive it was at 12.44 volts. Seems like it loses some just over one nite so I’ll have to get a more powerful charger and plan to keep it plugged in if it sits.

 

To be honest IMO there's nothing wrong with your car or your battery. Everything you have described is perfectly normal for a car that has sat.

Also when you read the voltage you need to go directly to the battery. You cannot read it via the terminals that are under the hood by the engine. There's too much parasitic draw in the system to get an accurate number that way.

But like I said there's nothing wrong, just drive your car. In the future if you go away for three weeks put it on trickle charger for the entire time and lock the car. That way the battery isn't drained as it sits.

 

The car will generally charge to a higher voltage if you drive in sport mode rather than normal mode.

 

My father in law always said "the right tool for the right job"


Putting a voltmeter across the terminals is not the right tool

siberian

 

Keep in mind a few things....

-12.2v is highly over-discharged.... but also consider if you are looking at that voltage after you have OPENED the door of you Macan then that is NOT the actuall voltage of the car since all the system go on when you open the door and they create a load on the battery..... so it might actually be at 12.6~8v in reality but you are looking at the voltage gauge when the car is engaged and ON, creating a load that causes voltage sag in your real-time readout.

While I'm marketing, the fact is IF you want to know your real voltage of the battery, and want to review your charging profiles when driving on in the Car we make a device called the Battery Tracker that will allow you to use a Bluetooth App to track you cars voltage completely meaning it shows how fast the draw is on the battery, how it charging when driving or when on the charger and what the profile is , so you can see the highest charge level... >>> https://antigravitybatteries.com/pro...tooth-tracker/

All the data shows on your phone in an app with 72 days of history and real time voltage, and you can check the voltage of the car before it wakes up and has a load on it.

Now with that being said you might just have a bad battery... but just wanted to let you know there are things you can do to analyze it.

 

I'm new to Porsche so I don't know if it's similar. But with BMW they have "smart charging" to reduce fuel consumption and wear on the battery. Basically they only charge the battery once a threshold is reached and under certain conditions, and then only up to a certain point. That's why BMW requires battery registration when the capacity changes (i.e. different size new battery) - I assume Porsche is the same. The charging profile also changes over the life of the battery to account for aging. Anyway, as a result the battery will almost always be at less than a full charge after driving. My BMWs generally seemed to be around 70-80% if I had to guess.

Anyway, echoing others that 1.25A is pretty low - that would take forever to charge a low battery. I think my CTEK is 4.7A and can take overnight to charge a very low battery.

 

Do you have to clamp it right to the battery or can you clamp it to the post in the engine compartment? If you have to clamp it directly to the battery how do you access the battery?

 

I always wondered what "the right job" was in that saying. I think it should be "the right tool for the job."

 

A voltmeter is the right tool, just not for that job. The defense rests Your Honor...

siberian

 

I checked the battery today after it sat overnight. 12.28 volts and the posts under the hood were at 12.18, so slightly less measured under the hood. My new 5A charger arrived and it has been on the front posts for 45mins now and still in the full charging mode.
While everything may be normal for this car (I have not load tested it yet) it certainly discharges far more than any other car I have and I do have another Porsche, a ‘16 GT4. That car does not discharge nearly as much as the Macan does.
Most of them with a recently charged battery if I put even the “small” 1.25A charger in them it goes full green in half an hour or something.
The battery is really buried on these cars but it was a good drill going thru all this.

 

When I first got my car, I spent about 2 hours configuring things in my garage with the engine off. This resulted in the battery being discharged. So I charged up the car using my 5 amp Deltran charger. I was surprised that even with a 5 amp charger it still had to be connected overnight to get to a fully charged state.

 

It is attached across the + & - terminals of the actual battery, not the post in the engine compartment. You need to know how to access the battery! It's in the trunk.
Keep in mind that, once installed, it stays that way. The app on your smartphone will allow you to read battery condition via Bluetooth.

 

This afternoon I put the new Battery Tender 5 amp chargers on my ‘25 Macan and ‘16 GT4. Both had been run yesterday for a good while. Both cars sat inside 55 degrees all nite and today until the chargers arrived. The GT4 went flashing green in minutes and full charge in like 10mins. BTW, its battery was new in April when I purchased it just like my Macan was new production in APR.

The Macan took just over three hours. Two exact chargers and two exact battery scenarios. Granted, I have not done the load test on the Macan which as I mentioned was on a dealer lot for months, purchased new with only 30mi on it, so not much attention to its battery for a good while. Load test aside, the Macan took three hours to top off a battery that started at 12.18 amps this afternoon? None of my other cars act this way.