A good way to check battery health?

[ardhout]

Interesting to see that Dreamm (yellow) health percentages aroung 20K miles are lower than average, and that most cars (or submissions) are still <20K miles
Not many cars which drive daily long distances. Or most submissions are from new drivers.

 

[Cosmo Cruz]

96.3 %
capacity 104.3 kWh
Remaining range 461 mi (21" Pirelli summer )
delivered 2022/9/29
~22k miles.
lifetime efficiency 3.3 mi kWh mixed summer and winter tires.

 

[Ktw13]

Is the author of API on this chat? I am wondering if its ok to show the graph to my neighbors who wants to get EV but worried about degradation.

 

[tarator]

I am sure the Home Assistant and LucidLogger can do this, but since I am too lazy to figure out how, I hacked a small script to retrieve only the battery capacity data. I run it once a day on my Raspberry Pi with the idea of making nice graphs once I collect some more data.

It script is based on vehicle_info.py from the python-lucidmotors repository.

import sys
import pathlib
import asyncio
import getpass
import rich
import logging
import time

# Allow running straight out of the repo
sys.path.insert(0, str(pathlib.Path(__file__).parent.parent.absolute()))

from lucidmotors import LucidAPI # noqa: E402

# logging.basicConfig(level=logging.DEBUG)

async def main():
async with LucidAPI() as lucid:
await lucid.login("...", "...")
await asyncio.sleep(1)
await lucid.fetch_vehicles()
res = lucid.vehicles
v = res[0]
vin = v.config.vin
bhealth = v.state.battery.battery_health_level
odometer = v.state.chassis.odometer_km * 0.621371
tstamp = v.state.last_updated_ms / 1000
cap = v.state.battery.capacity_kwhr
t = time.strftime('%F %H:%M:%S', time.gmtime(tstamp))
# rich.print(vin, bhealth, odometer, t) # lucid.vehicles)
print(f"{t} {vin} {bhealth:.2f} {odometer:.2f} {cap:.2f}")

asyncio.run(main())

 

[segbrk]

Is the author of API on this chat? I am wondering if its ok to show the graph to my neighbors who wants to get EV but worried about degradation.

Yes, hi!
Share away. It's public info. I'd suggest sharing much longer term data from sources like this though: https://www.nimblefins.co.uk/study-real-life-tesla-battery-deterioration
After all, Airs are only about 4 years old at most.

 

[I_Thr]

95.8%
delivered ~14months back
~16k miles.
lifetime efficiency 3.6 mi kWh with 19" All season tires

Charging habits and history:
I charge mostly from ~20's% to 80%.
~4 times charged to 100%
1st year : 80% of the times used the 350kw Electrify Charging stations
California weather.
Charging Frequency: Weekly once

@Cosmo Cruz I am interested in learning your charging habits as the numbers looks impressive after 2 years. Please share if you are comfortable.

If others can share these details, may be we can find some patterns.

 

[Andretex]

My touring is 22 months old with 29,800 miles on it. I have a lifetime mile/kWh of 3.7 and my battery health is at 94%. 19 inch tires. Still original tires too. I need to check if they need to be replaced soon.

 

[MGRMLN]

Is it better conclusively to keep the car plugged in and charging back to 80% daily regardless of use or waiting until the battery level drops below 50%?

 

[borski]

Is it better conclusively to keep the car plugged in and charging back to 80% daily regardless of use or waiting until the battery level drops below 50%?

If you’re gone a long time, it is best to set it to 50% and keep the car plugged in, regardless of where charge is now.

 

[dchesrown]

Air Pure AWD 18,900 miles 96.6%

 

[pjdcorp]

My Touring is 2.5 years old with 48kmiles. Had my battery replaced about 2,000 miles ago & it shows
Field 11, battery_health_level: 99.00000147521496.

Can I believe this ??????? If so, I'm going dancing' !!!!!

 

[Ktw13]

My Touring is 2.5 years old with 48kmiles. Had my battery replaced about 2,000 miles ago & it shows
Field 11, battery_health_level: 99.00000147521496.

Can I believe this ??????? If so, I'm going dancing' !!!!!

My brand new GT is 99.000% Dance away!

 

[Pwmac]

After 3.5 years and over 20k miles my battery health shows 93.6 but my kwhr capacity shows 105.8 kWh which assuming a 118kWh original capacity implies a 10.5% degradation. Not sure if that shows a discrepancy between battery health and capacity, but in any case I guess a 10% loss in 3.5 years isn't all that bad. Interestingly it also shows a range of 429 miles which is also the number I consistently get using my SOC and Miles showing on display and doing that calculation. Pretty sure that calculation of 429 miles is not accurate.

I think the max capacity is almost more telling. After 2 years my GT battery was replaced last June and max capacity was 101kwh. A year later I'm at max capacity 100.1 and when I charge to 80% I only have 80.119kwh available. So by my calculations I've lost ~15% of battery capacity but my battery health still reads 92.6%. I have to plan accordingly for trips because lifetime is 2.8mi/kwh so that means my GT can go about 280 miles and 250 if it's hot out.