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Theory: People who baby their batteries experience more "degradation"

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Dolemite

is my name
Sep 19, 2019
1,361
1,655
Seattle, WA
From the light reading I've done on this subject on TMC & elsewhere, it seems to me that people who have "never done this" and "always done that" seem to experience more "degradation." As has been discussed ad infinitum, this throws off the BMS & the car simply begins reporting inaccurate range. In the long run, I suspect these people (like myself) will ultimately end up with a battery that lasts longer, even if the estimated range/capacity is not perfectly accurate throughout its life.

change my mind
 

EV3_

Member
Mar 6, 2020
77
48
Illinois
Let me get the popcorn ready. This is going to be a good show.

A watched pot never boils? Or maybe those that obsess are laying in wait for the first 0.1% "degradation".

I'm in the use it and enjoy it camp. Let the technology do it's thing and if I keep the car 20 years, I'll pop a new roadrunner in it...
 

Dolemite

is my name
Sep 19, 2019
1,361
1,655
Seattle, WA
Same here. Especially if I can DIY it. I'm OCD to the nth degree, and as soon as I got the car, I just set it to % and let it go. I'll do a range/% calculation every now and then to see what's going on, but the numbers are constantly fluctuating, so whatever. If I can get 15+ years and/or 300K miles out of this thing, I'm good. By then the market will be flooded w/ batteries and the Chinese will be selling 2-packs on Amazon.
 

Matsayz

Active Member
Jul 6, 2019
1,174
889
Las Vegas
Same here. Especially if I can DIY it. I'm OCD to the nth degree, and as soon as I got the car, I just set it to % and let it go. I'll do a range/% calculation every now and then to see what's going on, but the numbers are constantly fluctuating, so whatever. If I can get 15+ years and/or 300K miles out of this thing, I'm good. By then the market will be flooded w/ batteries and the Chinese will be selling 2-packs on Amazon.

If you were really OCD, you’d be CDO... /Dad Joke
 

timmy818

Member
Jun 15, 2020
86
46
Los Angeles
I always top it off just in case something comes up and I can't afford to wait couple hours or go to a super charger to charge.


The lack of superchargers in the immediate LA area reeks of political corruption/lobbying.
 
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dhrivnak

Active Member
Jan 8, 2011
4,495
3,762
NE Tennessee
I agree. My 3 is now 28 months old with 42,000 miles. When new I got 310 miles on a full charge. Two weeks ago I did another rang charge as I do about every 4 months when I take a long trip, and got 310 miles again. My default charge is 90%.
 

Silicon Desert

Active Member
Oct 1, 2018
3,611
3,509
Sparks NV / GF 1
Mine hasn't degraded at all. When I leave it plugged in for a long time, the percentage still runs all the way back to 100%
:deadpan:
Hmmmm, doesn't tell me much. :) How long have you had the car and how many times you charged it? I'm guessing it is a fairly new car if you haven't seen much degradation yet. Even an old battery will charge to 100% (mine does), but the actual mileage available on a full charge is less.
 

Dolemite

is my name
Sep 19, 2019
1,361
1,655
Seattle, WA
1bks4v.jpg
 

Arctic_White

Member
Oct 28, 2019
140
87
Edmonton, AB
From the light reading I've done on this subject on TMC & elsewhere, it seems to me that people who have "never done this" and "always done that" seem to experience more "degradation." As has been discussed ad infinitum, this throws off the BMS & the car simply begins reporting inaccurate range. In the long run, I suspect these people (like myself) will ultimately end up with a battery that lasts longer, even if the estimated range/capacity is not perfectly accurate throughout its life.

change my mind

Interesting theory.

I drive my car normally: sometimes I accelerate fast but most of the time, it's been driven easily. I'll keep you posted to see how the battery degrades.

Either way, I am not worried. Batteries will eventually degrade and as long as the car doesn't give me too much trouble, I intend to keep it for at least the next 5 years.
 

alexgr

Member
Aug 13, 2019
894
798
42
From the light reading I've done on this subject on TMC & elsewhere, it seems to me that people who have "never done this" and "always done that" seem to experience more "degradation." As has been discussed ad infinitum, this throws off the BMS & the car simply begins reporting inaccurate range. In the long run, I suspect these people (like myself) will ultimately end up with a battery that lasts longer, even if the estimated range/capacity is not perfectly accurate throughout its life.

change my mind

You might be on something.... I rarely supercharge, charge home 30%-80%, and I only have 288 miles max left after 12k and 1 year. I think I charged to 100% about 3 times or so. I went on one 3k trip though with superchargers and wildly changing temperatures.
 

Dolemite

is my name
Sep 19, 2019
1,361
1,655
Seattle, WA
You might be on something.... I rarely supercharge, charge home 30%-80%, and I only have 288 miles max left after 12k and 1 year. I think I charged to 100% about 3 times or so. I went on one 3k trip though with superchargers and wildly changing temperatures.
I'm in a similar boat: <8K miles and suddenly the car decided to lose 10 miles of range. The other day it was 8. What's more likely - that the BMS is off, or the battery just suddenly decided to lose exactly 10 miles? Everyone I hear about flogging their cars etc. seems to have far fewer concerns about this stuff. Occam's razor and all that...
 

Gasaraki

Active Member
Oct 21, 2019
2,010
1,255
Syracuse, NY
Same here. Especially if I can DIY it. I'm OCD to the nth degree, and as soon as I got the car, I just set it to % and let it go. I'll do a range/% calculation every now and then to see what's going on, but the numbers are constantly fluctuating, so whatever. If I can get 15+ years and/or 300K miles out of this thing, I'm good. By then the market will be flooded w/ batteries and the Chinese will be selling 2-packs on Amazon.

I totally agree. Setting the display to percentage and drive.
 
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camalaio

Active Member
May 28, 2019
1,483
2,106
Vernon, BC, Canada
I'm in a similar boat: <8K miles and suddenly the car decided to lose 10 miles of range. The other day it was 8. What's more likely - that the BMS is off, or the battery just suddenly decided to lose exactly 10 miles? Everyone I hear about flogging their cars etc. seems to have far fewer concerns about this stuff. Occam's razor and all that...
As long as it's an "accurate" reported 10 mile loss (via car at 100%, not some TeslaFi extrapolation or something, around 25C temps), I don't see a reason why it couldn't have suddenly reported lower capacity. I'm pretty sure I'm in this boat. We recently went on a long trip, probably over 6000km covered, and only finally saw evidence of degradation over a month after we got back. I'm sure that degradation happened during the trip (Supercharging etc.), but the BMS didn't catch up on accounting for all that until later. What's funny is this happened when we started storing it at lower SoC to preserve it better (yepp, the topic of your thread indeed!) since this was about when COVID hit the fan in North America.

The thing not often discussed with "incorrect" BMS estimates is that it can go both ways.
 
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ElectricIAC

Devil’s Advocate
Dec 31, 2019
2,392
626
DFW
From the light reading I've done on this subject on TMC & elsewhere, it seems to me that people who have "never done this" and "always done that" seem to experience more "degradation." As has been discussed ad infinitum, this throws off the BMS & the car simply begins reporting inaccurate range. In the long run, I suspect these people (like myself) will ultimately end up with a battery that lasts longer, even if the estimated range/capacity is not perfectly accurate throughout its life.

change my mind
I'm inclined to agree. According to some folk, I beat the snot out of my battery yet over the last 24K miles i've only lost about 2 rated miles of range in my P3D and I charge to 90% every night.
 
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