Charge Model S 12V battery from ICE

[Thiago]

Hello all,

So I went on holiday and vampire drain brought the car to complete zero, including the 12V battery.

Now, long story short, I can access the 12V battery through the frunk but only have a jumpstart cable to connect to a ICE car, like you would do on a ICE to ICE jumpstart.

Question: am I completely mad to attempt to jumpstart my 2017 MS 12V battery from a ICE 12V battery using a standard jumpstart cable?

Thanks

 

[murphyS90D]

It will work fine. Hopefully you know how to open the frunk with a dead 12 volt battery. You don't need the ICE to be running. As long as the Tesla battery hasn't developed a shorted call the car will come alive as soon as the connection is made Open a Tesla door to keep the car alive and then disconnect the jumper cable. The Tesla HVB will charge the 12 volt battery.

My preference is to connect a smart battery charger, that knows what an AGM battery is, and use it to fully charge the 12 volt battery while the car sleeps.

 

[Thiago]

I will need to plug the car as soon as I can see open the charging port because at the moment, they are both dead.

 

[murphyS90D]

I will need to plug the car as soon as I can see open the charging port because at the moment, they are both dead.

The HVB is not dead. Without 12 volts it is completely disconnected from the car by contactors. It is below the minimum to charge the 12 volt battery however.

 

[Thiago]

I just thought I'd share my experience here... A bit.
So I plugged the cables onto the 12v battery of my MS and on my girlfriend's Polo and voilà, it charged just like I was hoping.
Can't deny it was not a bit apprehensive but in the end I was able to charge the 12v battery enough to open the car and move it to a charging location.
A call to the insurance would have resulted in around 100 euros. But instead it was just the cost of the cable.
Well, because I didn't find any other thread with this problem, I thought better to share.
Au revoir

 

[crazy_deba]

I just thought I'd share my experience here... A bit.
So I plugged the cables onto the 12v battery of my MS and on my girlfriend's Polo and voilà, it charged just like I was hoping.
Can't deny it was not a bit apprehensive but in the end I was able to charge the 12v battery enough to open the car and move it to a charging location.
A call to the insurance would have resulted in around 100 euros. But instead it was just the cost of the cable.
Well, because I didn't find any other thread with this problem, I thought better to share.
Au revoir

>>>
Could you please share how you got access to the 12 v battery

Rgds

Deb

 

[Thiago]

I

>>>
Could you please share how you got access to the 12 v battery

Rgds

Deb

I have a facelift model S. When you open the drunk, you'll see a plastic cover near the windshield. Start popping it out and the 12C battery will be lurking in.

 

[crazy_deba]

I

I have a facelift model S. When you open the drunk, you'll see a plastic cover near the windshield. Start popping it out and the 12C battery will be lurking in.

Thank you Thiago. I tried but then ended up seeing another cover I am guessing i need to remove that to get access tot he battery.

I saw this video on youtube. May be you can confirm if this will work. I have a Facelift Model S 75d