My Tesla 3 SR is only 4 months old with 4000 miles. It’s range has dropped from 273 miles to 267 miles at 100% charge, that is 2% in 4 months time. Is this normal? Anyone experienced same issue?
LFP BATTERY Degradation
Jeffyin
61 - 80 of 112 Posts
Sorry, don't want to be rude, but I provided all the evidence I had already, I won't get stuck in a Groundhog Day here.
Joined
·
207 Posts
ok, if you feel you supported your
Joined
·
23,691 Posts
@galimpic has done EXACTLY that. See post #49 above, and read it carefully. He provides three links to the exact types of studies that you are asking him to provide.So it is kinda on you to provide a study, or something that demonstrates LFP batteries should be charged like all vehicle batteries to maybe 80-90% and only 100% for road trips. Right?
We await.
Here is what I have got so far. Kyle Conner said charging to 100% should be OK but he's not sure if doing it all the time is OK. So even he was not sure, and he has all the connections. I just talked to the Tesla Rep about my new 3 arriving and asked about charging to 100%. They said sure its OK. I said there is controversy about this are you sure? She said they get this question all the time and 100% is OK. Like anything in the early days, its as clear as mud
This is the video with Kyle Conner asking a response about the LFP battery charging
here Kyle
This is the video with Kyle Conner asking a response about the LFP battery charging
Joined
·
5,998 Posts
Not quite meaningless. If you ask a binary question, their answer will be correct around 50% of the time.
Looks like Saturday is the day I get to drive this car home. Will snap some pictures. Anyone use the CCS adapter with the car? It will be about a month to get someone to install level 2 at the house.
Joined
·
5,998 Posts
The CCS adapter works great...if you can find a reliable source of power. Unless you drive unusually long distances daily, a mobile connector and a 115a plug will get you by.
My daily round trip is 76 miles so I need two FastDC charge per week for the first month. There are a couple of chargers near me but closest to my house is a EA 350Kw chargers.
Figure I would use that on Sunday and Tesla near work. Have to survive that until the L2 charger can get installed. You don't get a 110 charger with the car do you?
I use one, it works fine. If possible try to precondition your battery, but I am assuming you don't have supercharger nearby the CCS charging stations to fool Tesla into doing it, otherwise you wouldn't ask about CCS....
Joined
·
23,691 Posts
Here is a someones comment about the cleaner watt video. Makes great sense.
The flat part of the curve is probably flatter than shown in his chart. It is not possible to balance the individual cells in this part of the discharge curve because it is so flat, virtually horizontal. Consequently with lfp it is only balanced at higher voltages on the steep part of the charge curve (about 3.4 to 3.6v per cell) If you do not take to full charge regularly the cells will become unbalanced. Then as the battery is discharged an individual group of cells can fall bellow the minimum cell voltage and the battery will be shut down by the battery management system to protect the cells from further damage even though the total battery voltage would have suggested that charge is available.
The flat part of the curve is probably flatter than shown in his chart. It is not possible to balance the individual cells in this part of the discharge curve because it is so flat, virtually horizontal. Consequently with lfp it is only balanced at higher voltages on the steep part of the charge curve (about 3.4 to 3.6v per cell) If you do not take to full charge regularly the cells will become unbalanced. Then as the battery is discharged an individual group of cells can fall bellow the minimum cell voltage and the battery will be shut down by the battery management system to protect the cells from further damage even though the total battery voltage would have suggested that charge is available.
Very good explanation why LFP should regularly be charged to 100% to calibrate the BMS (along with fixing the inaccuracy introduced by the memory effect from small chargers). I just want to stress out that nobody disputes that, and that it doesn't mean it should be left at 100% or that full charge is good/desirable for the battery.
I think you have a good point on the issues with LFP batteries. I also think that to keep them balanced its crucial to their operation to hit 100% regularly. They are not the battery you can leave at 60, 70 or 80% charge and be healthy. They will become unbalanced because the BMS can not figure our how to balance them which is bad. I travel about 400 miles a week so I will be charging the car to 100% at least twice a week until I get a L2 charger installed. Hoping that doesn't cause issues for the month or two I need to do this. Once the L2 charger is installed my plan is to 100% to start the week and 80% daily.(following Teslas guidelines) I am posting this in case I anyone thinks this will be good or bad to post their thoughts. The best history we have is with NMC batteries. My hope is these batteries will last far last 200K miles, because that's the distance I typically drive my cars to.
I too think they should be regularly charged to 100%, which I do, as instructed by Tesla. I just don't leave them at 100% for too long, but it seems many people interpret it differently and try to have 100% as their goal to keep the battery at.
Joined
·
12 Posts
I bought my LFP Model 3 RWD late December 2022. I am experiencing that kind of degradation as well... started at 272 and now stops charging at 100% which it feels is 269 after basically three months of ownership! I saw CleanerWatt youtube channel that it's common for LFP batteries to degrade faster than NCM, at least with the information available so far.
I signed up on Recurrent for free battery health reports available one time a month. I just signed up a couple days ago as of this writing, so really curious as to what they'll say...
I signed up on Recurrent for free battery health reports available one time a month. I just signed up a couple days ago as of this writing, so really curious as to what they'll say...
I posted this before, but let me repeat my case: I bought M3 LFP in early Dec 22, charged mostly at home for the first 2000 miles, then went on a long trip with all fast chargings and now I have 7500. I do charge to 100% from time to time but never leave it at that for more than a few hours. My full battery reads at 270 now.
Joined
·
12 Posts
Thank you, I'm new here. Appreciate your input!
Joined
·
5,998 Posts
Am I misreading your post? Are you seriously concerned about a change in the range estimate of 3 miles? Your car might easily show an increase in range of 4-5 miles tomorrow. The Battery Management System does its best to estimate your range. But it can easily get "confused" by your driving and charging habits. But the bottom line is that degradation is real and it's expected. Probably expect 5% or more in year one, and then about 1% per year thereafter. A 3 mile change means nothing, absolutely nothing.
61 - 80 of 112 Posts
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
