My 2024 Prime premium 12v battery died so I had it jumped and drove to the dealer. They checked it and said there’s nothing wrong with it and I’m not using the gas engine enough. They don’t understand the car obviously. The battery gets charged from the traction battery whenever the car is in READY mode. Has anyone had this problem and if so what did you do.
Connect an external battery charger to the 12v battery and fully charge it up. Then remove the charger and let the car sit for 3 hours. Then, use a volt meter and measure the battery. What voltage do you get?
How did they check the battery, because I seriously doubt the drive would've recharged the battery enough for a load test to pass. Did they give you any numbers or any indications of what they actually did? I'd stop by an auto parts store for a free battery test. If it fails, take pictures of the Fail and test equipment they used and confront the dealership - ask to speak to the service manager. They should have their own test equipment and tell them you want to watch them test it again. Good Luck....
It took me about a week to realize that my battery drain is variable and unpredictable. The car can be unstartable in as little as 2 hours, or it can be fine for a week. I've gone full circle with 3 different dealers; even having the battery replaced, but no solutions at all. My workaround was to install a battery maintainer, which I plug in while parked at home.
