So my title is a little long but pertinent this time of year I think. It’s been between 20-55 degrees the last few weeks in Nashville. I’ve ready plenty on here about battery performance and the optimal exterior temps for Tesla batteries. My Normal ride to work is 15 min and I will be in the neighborhood of 250wHm on average. Lately with cold weather it’s been 450-575 in the same time frame in this colder weather. Once the battery’s start to warm it does go down to a more normal level but just want to verify that what I’m experiencing is normal from some the experts on here; those being longtime Tesla owners. I’ve only owned mine (used 2016 model S85D with 30K miles). For 6 months. I bought it in warm weather so this is my first bout of cold weather driving. Still not used to all the terminology and how to relate to watt hours per mile. Tonight driving home in rain and 56 degrees I never was below 305wHm. Is that normal or could it be my 12V needs replacing.....see below.
To add to my personal confusion and consternation my “check 12V battery, Replace 12V battery soon” Light just came on this morning. Since then reading more on here about the 12V I understand they may need replacing more often than most 12V’s. (I also saw where it’s pretty easy change one in a dual motor Tesla model S) I was told by a Tesla service writer that when you see this warning light you have approx 3 weeks to have it changed. Any truth in that by the experienced on here? I’m taking mine to the Tesla shop in a week (I hate their timeliness of getting to a customer; it’s such an impersonal process). A $200 venture. I Would love to hear from others. (By the way anyone know why they use a lead battery rather than an LiOn battery).
To add to my personal confusion and consternation my “check 12V battery, Replace 12V battery soon” Light just came on this morning. Since then reading more on here about the 12V I understand they may need replacing more often than most 12V’s. (I also saw where it’s pretty easy change one in a dual motor Tesla model S) I was told by a Tesla service writer that when you see this warning light you have approx 3 weeks to have it changed. Any truth in that by the experienced on here? I’m taking mine to the Tesla shop in a week (I hate their timeliness of getting to a customer; it’s such an impersonal process). A $200 venture. I Would love to hear from others. (By the way anyone know why they use a lead battery rather than an LiOn battery).
