Jeff4155
Member
But to be fair I do think Tesla should have an explanation for this, even if it is just a computer glitch.
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The real explanation probably relates to how unique, in the end, the specs of individual batteries are. There is some variance or perhaps even a lot of variance. Add to that some lazy programming where perhaps the cut-off point for charging uses a different rounding method than the percentage display...
Here are some details on the battery differences: Tesla Motors: PLEASE stop lying about specifications (60 to 75 upgrade)
Here are some details on the battery differences: Tesla Motors: PLEASE stop lying about specifications (60 to 75 upgrade)
As other have said, don't worry. You are not loosing any range. It's just a glitch of how the percentage is calculated and shown.
MikeBur
ManualPilot
I had similar for about 2 months (4 different 100% charges for long trips) about a year ago. Side note: Now I find it's actually pointless going beyond 90% as it's counter-productive as it didn't save any time at SpCs ;-). I know the batteries balance at 100% for a while, though when app says charging complete it was at 99% immediately.
Anywho, my OCD kept kicking in and I remembered some of the old runs on battery charging we measured way back, some thinking on how the BMS estimation works. So I drove to 1 mile remaining before charging back to 100%. This appears to work for me and I've, thankfully, never seen it since. Of course YMMV ;-)
Good luck, and if this doesn't solve it then just don't set it beyond 90% - it's the next nice round number and much nicer to your batteries
Anywho, my OCD kept kicking in and I remembered some of the old runs on battery charging we measured way back, some thinking on how the BMS estimation works. So I drove to 1 mile remaining before charging back to 100%. This appears to work for me and I've, thankfully, never seen it since. Of course YMMV ;-)
Good luck, and if this doesn't solve it then just don't set it beyond 90% - it's the next nice round number and much nicer to your batteries
No, not really. I will charge to 90% overnight, then trip charge to 100% an hour or so before leaving. That should get me to 100%, but what happens is I will get nearly my normal charge rate (29 or so miles per hour the whole time), then I get stuck at "5 minutes left" or something like "calculating remaing time". At that point, I'm within a mile or two of what I should be at based on my 90% rated miles, and it makes no sense to wait further.
It's a 2015 S70 with a 90% of 219 RM, 100% of 240+ RM. Those numbers are higher than spec, have never dropped, and seem real, so I'm not sure what's going on there. Not complaining, though.
I have seen this behavior as well and consider it normal.
I've charged to 100% and left the car sit and in 1hr or so the battery level drops. But that is not what is happening here. I've had the car complete charging as low as 96% when set to 100%.
My worry is that the battery management system is not properly balancing the cells. When the issue first started, Charging completed at 99%. In less than a month it went down to 96-98%. If there is something wrong I worry that the charging system could be causing damage to the battery cells. My last battery had a few miles on it and obviously went down quickly after the charging issue showed up.
The new battery has been more consistent, Just worried the new battery can be damaged as well.
Yes, multiple Level 2 chargers & superchargers. All the same behavior & I've had charging complete at 99% at superchargers as well.
One of the reason why this 1% bothers me so much is because of the extended time at the superchargers.
In warm temp a 100% took 1hr 10min
In cold temp a 100% took 1hr 30 min
Once the issue showed up a 99-100% charge now takes a 2 hrs.
In cold temp a 100% took 1hr 30 min
Once the issue showed up a 99-100% charge now takes a 2 hrs.
Today charging to 100% is becoming less required. Tesla is putting up more superchargers and I can get to some of the same places with less charge. By the end of this year, some of my previous destinations that required a full charge just to get there will now have a supercharger.
But the worry is still there. If this is just a bug than i wish Tesla would just fix it. My worry is that it's not a bug and my battery management system is causing damage to the battery.
This thread reminds me of the guy that went for months complaining that his dual charger S with his HPWC would only show a max charge of 79 Amps instead of the 80 that he expected. The man made his local Tesla SC's life a living hell over an inconsequential OCDism.
whitex
Well-Known Member
Th behavior I was talking about was an instant drop of SOC estimate as soon as the charger is disengaged. I've spent over a decade working on battery powered Mobile devices, specializing in power and performance optimizations, and believe me, you can observe this behavior on phones, tablets, etc. Some modern devices do not exhibit this behavior, but that's only because they have a special provision in software that doesn't immediately adjust the displayed SOC to avoid things like this (and % going up and down by small percentage when phone is in use).
You have full unlimited warranty on the battery, why worry?
Don't mention the 50 page thread about Supercharger speed throttling. Oh shoot, look what I just did!
