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Is the 10% degradation per scanmytesla and teslafi after only 7000 miles real?

MY-Y

Member
Mar 4, 2020
882
914
MD
I've read many posts on this, including the tricks to help the BMS recalibrate. Both scanmytesla and teslafi say I've degraded 10% in just 7000 miles. I'm gentle on the battery, only charged above 90% a few times for a short period when it was cool out. I'm not worried, but am a little confused. Many folks seem to have minimal reported degradation. One more observation. The max charge my phone app lets me set is between 93% and 99% depending on how low I am. It will show a 100% max when I hit ~90% or so.

When I do the battery capacity calculation from the energy screen, I got ~72 kWh a couple of weeks ago before that sharp drop shown on Teslafi. Its a little below 70kWh right now.
Thoughts?
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Last edited:
Oct 3, 2020
169
180
Seattle
I highly doubt your pack is experiencing that level of degradation, especially with such little DC charging.

I have a hunch that this is more related to how the BMS calculation of remaining capacity is effected by colder temperatures. It is already proven that cold temperatures will temporarily reduce the capacity, so I think it’s safe to assume that after months at cold temperatures, the BMS may lose calibration with the pack’s true capacity. After all, the new capacity is only achieved at a specific temperature range.
 

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