@LeoNordic Wow, 190 miles on a standard charge is basically a new battery. Do you store your Roadster in standard or storage mode? I've heard conflicting reports on which is better for the battery on a garage queen.
2011 2.5 with 71K healthy miles. I've reupholstered the seats but she has never had any mechanical updates/changes done to her. She's def getting older now that I think about it! She's been garage queened (it that a word?) since getting my Model S exactly 3 years ago. She was a daily driver for about 4 years. About every 2 weeks, I drive her 50-100 miles to keep the blood pumping through her. She gets her annual maintenance regardless of use. It runs and drives pretty much the same as the day I got it (I'm the second owner and obtained her with 24K miles in mid-2013). She seldom sees rain and has never seen snow. Standard charge is 147 miles. I haven't range charged her in a long time. She takes whatever I throw at her and silently zooms past pretty much everyone on the road that I'd like to have behind me.
My new to me #314 gets 187+ standard charge with 10,000 miles on it. Some things I know about it... VERY rarely range charged Only charged slowly with 110V standard cable ever Car spent life in mild Seattle Owner believes the slow charge was most important. @petergrub has in one of his charging newsletters the same advice about charging slowly when/if you can I know data was collected here by owners that the main factor was heat. I know from my engineering days that heat and vibration kill batteries but remember heat is also generated during charging YMMV
I lost about 1-2 miles sitting unconnected for ~6 weeks in repair shop. I agree that keeping plugged in is a key. I have range charged a few times, and hit faster destination chargers, but by far, them most noticeable loss of even slight amount of range was sitting in repair shop. That slow discharge over 6 weeks hurt it. Also saw some loss, based on log file, during transition between owner/dealer and my purchase...again, it was left unconnected with slow discharge over several weeks.
Do note that the range of the car is always an estimate, and is dependent on temperature and the recent history of use, along with the actual health of the battery. My car's full standard charge rises and falls over the course of a year, for example, and it's always a few miles longer if I charge slowly vs faster. But it is physically impossible for the actual health of the battery to improve over time. That exercise of running the car down to a low (but not zero!) range, then charging it all the way back up, is a way to have the car get a better "feel" for where the two ends of the battery's charge curve really are. "CAC", after all, is the "Calculated Amp-hour Capacity". It's calculated based on a number of factors, but it's still an estimate that will always be in error to some degree. So that loss of a mile or two of range could simply be that the car's estimate was adjusted based on some temporary factor. Only time (months) will tell if it's real or not.
Interesting points about the car not being plugged in and how much that can (potentially) hurt the battery. I used to feel that way intuitively but I've backed off that belief in recent years. I have definitely let the car sit for 3-5 weeks at a time without being plugged in since garage queening her. Maybe I'll go back to being more cognizant of that if it will have an effect on batter health long term. I just don't think the data I've seen or the results of the car's slow loss of overall charge is related to that (where I think high mileage is 99.9% of the reason). I tend to think it may just be a calculation error (gregd spoke to that a bit) and that the battery is just fine by just sitting.
You can see lots of data on the Roadster battery survey. If you own a Roadster, please share your experience, or use the update form if you're reported before. One thing to keep in mind: the car can't know the pack's capacity if it hasn't seen it charge and discharge recently. The longer the car has sat without being driven through a significant portion of the battery pack the less reliable the rated range and CAC numbers are.
I have Roadster 901, named Stela - as in.... "Wow, that car is really Stela" (if said with a Boston accent that would translate to stellar. Also an anagram for Tesla.). She has a bit more than 26,000 miles. I drive her 2 to 3 times per week and keep her plugged in whenever I'm not driving her. I charge on 220 in my garage. About 2-3 times per year, I charge on range - the last time I think I got around 215 miles. I got the car when it was 3 years old and was getting about 181 miles in standard mode. It is now down to 170. I notice I lose about 2 miles per year. Per the advice of the service center, I once put it in storage mode. When I took it out, I had lost 2-3 miles off the battery. I haven't done that since.
New to posting, but I have #934 pushing 22K miles only. Standard gives me 165 when I charge but estimate less than 400 miles/year. Some of the higher miles was the long drive to Tyson’s before Richmond opened—and outside temps were critical even on a Range charge.
Previous owner and now I always has it connected and set on standardcharge.(86-88%?) always on a std householdsocket low amps. Like 2kW. I think when we looked at the logs it had only been rangecharged twice in it’s whole life. Mostly because previous owner only used if for shorter trips. It was very seldom driven lower than 40% if i remember correct. Of course both the displayed CAC and rangeestimate can be fooled since it has almost never seen the ”limits” of the batterycapacity. But on the other hand the little I have driven it, it seems to be quite correct in its estimate. Right now when it is like +5C in my garage it says a steady 301km i std charge sometimes a bit higher when it tops up the charging a bit. But that happens quite seldom.