One could argue that the vehicle is no longer as advertised. The RWD 2013 model S was advertised with somewhere in the neighborhood of 260 miles range. When new, my car charged to 257 miles at a 100% charge. After 6+ years, my car had a range of 253 miles at a 100% charge one day before Tesla forced the update on my car, which now results in a range of 223 miles at a 100% charge. So in 1 day the range of the vehicle went from a range substantially equal to the EPA advertised range to a range out of compliance with the EPA advertised range. So the vehicle is no longer as advertised.
Hi, I find the numbers interesting.
Being Elctronics Engineer for many decades and from reading Li-Ion papers for years, my brain rules out, that a degradation of 1,56% over six years of use is possible. I think the BMS has failed to correctly identify/estimate/measure the degradation. Only the new Jeff Dahn & Dalhouisie Team NMC cells degrade that little
A Wide Range of Testing Results on an Excellent Lithium-Ion Cell Chemistry to be used as Benchmarks for New Battery Technologies
Own experience with Li-Ion (NMC though) is:
A: Even with the most perfect treatment of Li-Ion, internal resistance grows over time, so with same remaning capacity, range should be shorter, just because of bigger heat loss.
B: At work we have Lenovo Laptops, that have been powered on everyday, but at only 55% StateofCharge. The BMS thinks they did not degrade at all over the last 3 years, but the battery life from 55% and down is terrible and the battery goes warm, so has high internal resistance
C: I had to dismantle my 8 year old Nokia Windows Phone last week and lift the cell voltage from 2,45V to 3,22V before battery protection allowed it to charge, because it had been powered off for some months and my son wanted it for Alarm Clock. Battery has same capacity as last spring (it only charge to 55% only as well
) but the self discharge, when powered off, is approx 5% per 2 days.
All above changes reduces 'range' So I propose that the 253 miles of range was dead wrong (as Tesloop and Tesla Bjørn has experienced with cars dying with miles still on the gauge).
I cannot know whether your capacity should be 223 miles or higher, that depends on whether your batteri has been top-capped.
If you were hit by both 'more correct estimate' and capping, then Tesla's timing is bad. If they first told us that the fantastic low degradation we (*) have experienced was partly due to a bad BMS algorithm and that a new version of SW now report the correct range, so we no longer risk stranding a cold vinter night on a dark highway, then we may have accepted that as necessary. (And Tesla will not need to replace batteries, which they had to for both Tesloop and Bjørn)
A later message to those capped, that the capping is a temporary safety measure, untill Tesla figures out how to handle the assumed safety issue, would as well be less bad for Tesla trustworthieness, than this thread.
(*) Dec 2015 S 70D, BMS Reported range when new: 364 km, now 351 km a dgeradation of around 3,5%. Never the less I tell ABetterRoutePlanner that my battery has degraded 7% and my car uses 205 Wh/km at 110 km/h, which makes me hit the SUC with 17%, when ABRP calculted 18%)
