298 miles is my new 100% (LR RWD)

[Sparky4life]

Went down to 18 miles yesterday then a full charge overnight. Finished at 3AM with 296. Crud.

I wouldn't worry about it. There's a lot of variation and it's unlikely to be real degradation. It's unfortunate that it's difficult to separate real degradation from variations in the capacity estimation algorithm, but that's battery chemistry for you...

 

[Sparky4life]

Did my first full charge last night, wife and I are taking a mini trip to Santa Barbara from Orange County.

Interestingly enough, charging “finished” at 305 at 4am. Then I just woke up, started charging again cause I assume I have 310 max range. Well, it’s slowly creeping up 1 mile to 310 every 1/2 hr. I’m at 308 now. But it is telling me it’s complete.

3p+ 1700 miles. I am guessing it will get up to 310 soon. Using 30amp plug.

Anyone seen this before?

Perhaps just cell balancing?

 

[Sparky4life]

Well, the deep discharge did nothing for rated range at 100% charge.

View attachment 389117

For me it took multiple deep discharges before the BMS figured out that there was more capacity than it thought there was and I saw *no* change after the first deep discharge, just like you. So, you can do more deep discharges like I did, or just not worry about it

 

[surfrasch]

just bumping this up with my experience. Car is AWD LR, 4 months old, 3700 miles on it.....have only brought to full charge maybe 4-5 times, each time it made it to 307-308 miles. Have never seen 310, and typically I don't discharge really low, leave it plugged in every evening to 80%......typically around 248 mile charge.

I'm on 2019.8.3, decided to use up the charge this week and bring back to 100% last night to see if it would recalculate to 310. Got it down to around 30 miles, charged overnight, it only went up to 301. I'm thinking I didn't discharge it enough, but reading through here it sounds like it's just a calculation so I'll live with it.

 

[bnsfengineer]

I have a LR RWD (vin 58xxx) with 2019.5.15 firmware. On Feb. 13th, I was getting 308 miles of range at 100% charge. Over the course of the next 3 days, my range at 100% charge has dropped to ~298 miles.

View attachment 386291
Here are the 4 charges I did over that period (to 80%, projected to 100%) along with the displayed rated range at the completion of the charge:

View attachment 386292

The ~20 charges I have done since then have all been consistently around 298 miles (projected based on an 80% charge). I tried discharging to ~20% followed by a charge to 100%, three times, as recommended by Tesla to 'recalibrate the BMS'. In both cases, the max was still at 298 miles:

3/3 charged from 19% to 100%, added 242 miles; 242/0.81 = 299 miles
3/7 charged from 23% to 100%, added 230 miles; 230/0.77 = 299 miles

The 2019.5.15 firmware update did not change my numbers at all. I'm concerned that I may have a bad cell in the pack?

I remember a Youtube Video

 

[Nfuzzy]

I have only been using TeslaFi the last 2000 miles or so. LR RWD with 21k miles in less than 11 months. Battery report varies from 298-302. 5.15 didn't show any change for me either. I leave display on % for one reason not to sweat these small changes.

I think temperature has a lot to do with it though and we'll see if it pops back up in summer. Either way I'm not concerned, still very low degradation for the amount of driving and 100% charges I've done.

Well, what do you know. I drove down to 5% last week and now I'm right back to 310 range ever since. It has also been warmer, so go figure.

 

[Sparky4life]

Looks like there has been an update to the BMS capacity estimation algorithm. Over the past 1,000 miles I have been sticking very close to 309.5. I have not done any of the 'recalibration' exercises either, just my regular 60-80% cycle. More evidence that this variation between 310-295 is just a software thing and real, physical battery degradation is still unmeasurable after ~19,000 miles! Sure beats my 2011 LEAF