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  • The final cut of TMC Podcast #21 is available now. We covered the recent wide release of FSD Beta and shared our experiences. We also discussed the best times to charge and Tesla's official CCS adapter. You can watch it on YouTube.

Battery Degradation (Canadian Version)

I got hands on the OBD cable for Tesla with Blue colour connection socket

and I have a OBDLINK adapter lying around (used to debug my ML550)

The magic combo of Bluetooth adapter and Tesla OBD cable finally making real data

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The above is an 100D model s with VIN 215XXX
Half Home charging and half supercharging

Assume when battery is brand new, it’s perfect 100kWh pack

After 12k km and above charging pattern, the pack degrades 1.9% (1.9kwh out of 100kWh, easy math for 100 pack)




8723F367-DBD8-4449-BCEA-D62B4C99D67F.jpeg
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The above is a 100D with lots super changing and little Home charging

VIN 755xx, 14k km

100D pack degrades 2.7%



Personal conclusion
Lots supercharging is not good for the battery


One side note


04F6A428-254C-4AF7-B109-0B77C35527F9.jpeg

Data is Model S 100D
When the battery is warm
I can achieve peak output 428kW
Regen has peak about 73kw with average 68kW

So it’s uncorked as conclusion
 
Oh that means both of 100D I tested has degraded ~5%

But still, chemistry changes over time.

Does anyone in GTA has recently delivered 100D so I can test the pack?
also, attributing the greater degradation to supercharging may not be accurate either .

Maybe car A charged to 80% all the time and car B charged to 100%?

Maybe car A will degrade another 1% in the next few thousand kms once it reaches parity with car B


The polls I've seen have shown supercharging, weirdly, is better than home charging for battery degradation. Not sure htey used OBDii sourced data though which is much more accurate to get a feel for how often someone supercharges. This was a poll done on the site using slightly vague categories like always supercharge, often , rarely and never. The always and often guys had less degradation than the rarely and never guys. Neat.

Would love to see that data on my car. It's a P90D with the first 90 battery and I've seen max energy capacity drop from 429 kms to about 410 kms over 3 years and 50,000 kms. Would like to see the real data. The 90 battery actually was an 85.8 kwh battery when new. That's why when the 100D and P100D came out people questioned how the 100D could have 19% more range with only 10% more battery. It's not 10%...it's actually 19% more battery.

Nominal capacity when new:
100 = 102.4 kwh
90 = 85.8 kwh
85 = 81.8 kwh
75 = 75 kwh

I don't know why they named the batteries the way they did. Rounding...? nope. makes no sense.

In reality the 100 should be 100, 90 should be 85, 85 should be 80, 75 should be 75.
 
  • Informative
Reactions: mrElbe
also, attributing the greater degradation to supercharging may not be accurate either .

Maybe car A charged to 80% all the time and car B charged to 100%?

Maybe car A will degrade another 1% in the next few thousand kms once it reaches parity with car B


The polls I've seen have shown supercharging, weirdly, is better than home charging for battery degradation. Not sure htey used OBDii sourced data though which is much more accurate to get a feel for how often someone supercharges. This was a poll done on the site using slightly vague categories like always supercharge, often , rarely and never. The always and often guys had less degradation than the rarely and never guys. Neat.

Would love to see that data on my car. It's a P90D with the first 90 battery and I've seen max energy capacity drop from 429 kms to about 410 kms over 3 years and 50,000 kms. Would like to see the real data. The 90 battery actually was an 85.8 kwh battery when new. That's why when the 100D and P100D came out people questioned how the 100D could have 19% more range with only 10% more battery. It's not 10%...it's actually 19% more battery.

Nominal capacity when new:
100 = 102.4 kwh
90 = 85.8 kwh
85 = 81.8 kwh
75 = 75 kwh

I don't know why they named the batteries the way they did. Rounding...? nope. makes no sense.

In reality the 100 should be 100, 90 should be 85, 85 should be 80, 75 should be 75.

I see the thread talking about the Nominal capacity when new, however the data point is very limited as well

since @Bluewish has a fairly-new 700km 100D, it could be used as a data point for current Nominal capacity as new-ish pack.
 
Interesting thing happened...

During Firmware download/installing, my car is charged over my set limit (80%) to 100% (known bug)

Since when charge to full (100%), the car will attempt to balance cells

Overall, Model S nominal full pack increase from 98.1 to 98.3 now (0.2kwh increase)

Personal conclusion:
Balance the battery does help a bit, but definitely should not be done often (3mo maybe, 6mo definitely )

Screenshot_20180329-085346.png
 
I used both TM Spy and Scan My Tesla app and got these numbers from my Model X 100D pre-delivery here in Norway

100D Measured VIN JF08XXXX (mine)
Advertised Full Pack 100 kWh
Nominal Full Pack Pack 96.9 kWh
Energy Buffer 4 kWh
Usabel Full Pack 92.9 kWh
Only with 40.6Km / 25.22 Miles on the odometer Brand New at pre-delivery. Finished in production january 14th 2018 and shipped to Norway. BMS said state of charge at 58.5 % ,366,32V 1.0A and 10 mV difference from highest (3.821V) to lowest (3.811V ) battery voltage
 

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