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plugged in, no power at all

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battery dead
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9.9K views 33 replies 8 participants last post by  RonDayVous  
#1 ·
It's Labor day here in USA so CS is closed. Here's the details. Sunday morning, car at home charged over night to 90% (trickle charge). Drive fairly far and return with about 36% (10am ish). Plug car in so I can drive far later in day. At about 1pm I check and car is in low 40% area, I think 44%. This is not enough to get me where I'm going and back so I get out of car (still plugged in) close door and take my other car. When I check the car that night (been plugged in all day, have scheduled to not charge from 4pm to 9pm), the car is COMPLETELY dead. Luckily I left it unlocked. Nothing happens when I enter the car. No indication light on at charger. I check the app and it says something along the lines of 'charging error, unplug and replug charger'. I can't unplug because there is no power at all so the plug is locked in there. I'm guessing that the 12 v is dead, but wanted to see if anyone has experienced anything along these lines before I try to jump start.
 
#13 ·
FYI - If all the systems are working correctly, and you don;'t have a short in the 12v battery, the traction battery, even with 40% SOC, will automatically re-charge your 12v battery. I am 100% sure of that. But only if there isn't some other issue...like a bad 12v battery.

Also, when the traction battery is charging, it also will re-charge the 12v, as needed.
 
#17 ·
Well, that's some progress. From the link I said, if it's "solid white" on the charge cable:

The charging cable is ready to be plugged into the vehicle.If the LED indicator is white but charging is not possible:
  1. Unplug the charging cable from the charging socket.
  2. Plug the charging cable back into the charging socket.
  3. If the indicator doesn't begin flashing white within 10 seconds, unplug the charging cable from both the charging socket and the wall outlet. Plug the charging cable back into the charging socket and the wall outlet.
  4. If the problem persists, contact Polestar Customer Support.
 
#18 ·
Hard to say whether it's the charging cable that's at fault, the 12v battery, or something else.

If you want to learn about your car, and you have a trickle charger or 12v jump box at home, you might try pulling off the cowling on the right side of the car (while facing the car from the front) to access the jump points for the 12v battery....Since this would be your first time, would take about 10 min...happy to walk u through it if you care to try?
 
#21 · (Edited)
If I had to guess, I'd say you have a defective 12v battery, or loose connection...given no power to the car. Normally, and like I said, if things are working as they should, the 12v battery should have been automatically charged during the time you were charging the traction battery. But if the 12v battery goes down, or the connection stops, say, then that will shut down the operating system and controls for the car...including charging the traction battery will be discontinued.

Given the order of events that you described, I would say that sometime during your charging of the traction battery, either the 12v battery had an issue, or a connection from the 12v battery opened/shorted...thus discontinuing power to the rest of the polestar systems....and if they go down, you won't be able to charge your traction battery.

It's not the end of the world, but the only way you can self diagnose to determine if it's the 12v battery, is to try and jump start. If you haven't tried before, I think it's a good thing to learn...ie, better at home than while on the road. Also, I would recommend, as I did a long time ago, get a BT 12v battery monitoring system. You can get from Amazon for about 30dollars and you attach it to the battery. You can access the health of your battery anytime you want through it's Blue Tooth connection. That way you will always know if your battery has issues before something happens.
 
#23 ·
OK - I don't have jumper cables but I do have triple A! They arrived in 15 minutes and we were able to jump start the car. they suggested I bring in the car/get a new battery. The only thing that still makes me nervous is that although it is now charging, the screen indicates 0 mi/h 1~ 12/48A 114V

I know trickle charge is slow (I have done that the whole 2 years I have owned it so far), but I don't recall it ever saying 0 mi/h

Just nervous there is something wrong. The only time that has happened was after a reboot once the amperage limit was reset to a very low number. I checked that and it is set at 48 amps so that is not the issue this time.
 
#27 ·
Good to hear. (y)

I would get a 12v car battery monitor, so you can easily keep track of the health of your battery. Also, I probably would take it into Polestar to have them check out the 12v battery to see if there is anything wrong with the battery or connections. Not normal for the 12v battery to go dead while charging?
 
#28 ·
Image
if you haven't already taken any panels off affixed with push fasteners it is relatively easy. The center pushes in and then the fastener can be lifted out. The right panel under the hood just pulls out once the fasteners are removed. Right of the storage bin you will see the 12v battery and positive terminal exposed. I used a ground wire attached to the frame below under the frunk storage bin for the negative terminal. I noticed just getting 12v power to that battery was enough to jump the car when my 12v died.
Image
 
#32 ·
Just seeing the pics and info here. thanks so much! Had no problem getting cover off. Is there a trick to getting those button thingy's back in and locked? Car has been running fine since it was jumpstarted. I have it scheduled for a diagnostic check next week at a local Polestar Service center. Hoping they can figure out what caused the battery drain.
 
#29 ·
Yes, since the 12v battery doesn't have to run a starter motor, like in ICE cars,...but just enough juice to activate the electronics, the required amount of juice needed from the jumper box is minimal. Once the 12v systems are functional, the 12v battery should then be automatically re-charged by the traction battery. There is no alternator in a EV, so keeping the 12v charged is from the traction battery.

I think those that have had a relatively new battery go dead, need to satisfy themselves whether the battery is defective, and can't hold a charge. That's where the battery monitor would help you to make that determination.