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Discussion Starter · #1 · (Edited)
Reddit source: https://old.reddit.com/r/BoltEV/comments/a1ez8j/battery_degradation_stats_i_found/

Title: MyChevy App Reveals Juicy Technical Details On The Chevy Bolt Battery
https://insideevs.com/mychevy-app-reveals-bolt-ev-details/


>>> begin quote >>>
Battery Degradation

Regarding battery degradation:
The kWh capacity degradation by odometer. Used as fallback for estimating remaining battery capacity from odometer, when no other capacity information is available. The first column (D0…Dn) is the odometer in km, and the second column (C0…Cn) are the corresponding capacity values in kWh. The table is based on empirical data assuming typical driving behavior of ~30,000 km/year [18k miles] and 1 DCFC/week.

As noted above, this data assumes “typical driving behavior.” It is an estimate for the drop in capacity over time. Depending on the habits of the driver, capacity loss could vary. Excessive fast charging and extreme temperatures are more likely to lead to increased degradation. Maintaining an optimal state of charge and not pushing the car should result in less capacity loss over time.


Here is the estimated degradation according to the document:
[
odometer in km, estimated available capacity]
kWhCapacity_Odo_Degradation:
[
[0.0000000, 60.00],
[24140.160, 60.00],
[48280.320, 58.96],
[72420.480, 57.93],
[96560.640, 56.89],
[120700.80, 55.85],
[144840.96, 54.82],
[168981.12, 53.78],
[193121.28, 52.75],
[217261.44, 51.71],
[241401.60, 50.67],
[265541.76, 49.64],
[289681.92, 48.60],
[313822.08, 47.56],
[337962.24, 46.53],
[362102.40, 45.49]
]

At 225,000 miles, a Chevy Bolt EV owner can hopefully expect at least 175 miles of usable range. Vehicles that rarely ever see DCFC charging should fare better than this. These numbers assume 1 DCFC fast charge / week.
<<< end quote <<<
 

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So DC fast charging shortens the battery's life? Does that apply to Tesla Supercharging as well?
 

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So DC fast charging shortens the battery's life? Does that apply to Tesla Supercharging as well?
Technically yes, practically not so much. If you regularly charge the battery of any EV to 100%, whether by Supercharger or using Level 1 or 2 charging, then eventually the battery capacity will be affected. Supercharging to 80 or 90% whenever you need to charge while on the road is both more efficient use of your time while waiting for a charge and better for the battery. Tesla's software manages the lifetime Supercharger rate of each Tesla vehicle's battery pack. The more you use the Supercharging feature the algorithm will gradually throttle back on your maximum charge rate to preserve the life of the battery pack.
 

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Technically yes, practically not so much. If you regularly charge the battery of any EV to 100%, whether by Supercharger or using Level 1 or 2 charging, then eventually the battery capacity will be affected. Supercharging to 80 or 90% whenever you need to charge while on the road is both more efficient use of your time while waiting for a charge and better for the battery. Tesla's software manages the lifetime Supercharger rate of each Tesla vehicle's battery pack. The more you use the Supercharging feature the algorithm will gradually throttle back on your maximum charge rate to preserve the life of the battery pack.
Cool! That sounds like a great system. So when you plug into a Supercharger, can you program it to stop at say...80%, or do you need to be there to pull the plug?
 

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Cool! That sounds like a great system. So when you plug into a Supercharger, can you program it to stop at say...80%, or do you need to be there to pull the plug?
You can set it manually for via the phone. Setting it to the trip (90% to 100% range is fine for short periods of times).
 
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