Submitted by hirorir on Sat, 2018-08-04 23:03
I received my Model S 75D at the end of June 2017, and have put 25K miles on it to date. I decided to check up on the condition of my battery recently, since I noticed a rather sharp drop in overall range over the past 6 months.
I just drove 123.4mi on what the MCU estimator considers to be 33.6kWh of energy - at an average of 272Wh/mi, which seems really good.
However, this was also going from 90% to what the car thinks is 36%. Doing the math on this (assuming linear discharge) my max range is 228-229mi. When I charge to 90%, the car estimates a range of 217-218mi (I always lose 10-20mi from the estimate going from 90% to 20-30%). Putting this against 100% at 259mi as advertised, this is about 12% less than it should be.
Should I be concerned, and how should I address this?