I've got a pre-facelift 2016 90D. It has the gen 1 (aka "worst") 90 pack and about 56k miles.
I'd had it for about a year and put about 10k miles on it. Very little but occasional supercharging, mostly charging to 90%+ on a 30a/208 charger using the "free" charger at work; sometimes charging as high as 98%. I'd immediately drive it down to below 90% and typically recharge at or below 50%. After a year of this the battery estimate went from 249 (90%) or 277 miles up to sometimes even 251(90%) or 281 miles at 100%.
Then I had a change of plans with the pandemic and started driving to a place where I had no convenient l2 charging but very convenient supercharging -- a supercharger near a supermarket. After several months of mostly supercharging and driving the car from 90% to 15% regularly, the battery seemed ... mostly the same. I rarely / never charged it even to 90% on the supercharger (usually would pull it off around 70% when the charge rate decreases substantially). I'd rarely / never let SOC get below 15% and didn't push it when at low SOC.
Very recently, we ended up driving the car pretty hard with a somewhat low SOC, to the point that a couple times the "limited power output" triangle showed up on the power / regen meter. I'm used to seeing it when it is cold, and I've also occasionally seen it as a limit when *very* cold, but never seen it due to low SOC. When we parked (with about 5% SOC) the car estimated that the pack had a maximum capacity of 236 miles at 100% (vs the typical 277...). After charging for a while it bounced back, mostly...
But since that last trip the battery's been charging at best to 248(90%) or 274(100%) though sometimes it'll guestimate that it can charge all the way up to 249.
Now -- the 1% difference is basically nothing relative to how I use the car, and it is possible that all the supercharging I'd been doing contributed to the wear and I hadn't really been keeping track (boo, not using teslafi), but it seems like there might also be a relationship between wear and how the car is driven at high and low SOC.
Thoughts?
I'd had it for about a year and put about 10k miles on it. Very little but occasional supercharging, mostly charging to 90%+ on a 30a/208 charger using the "free" charger at work; sometimes charging as high as 98%. I'd immediately drive it down to below 90% and typically recharge at or below 50%. After a year of this the battery estimate went from 249 (90%) or 277 miles up to sometimes even 251(90%) or 281 miles at 100%.
Then I had a change of plans with the pandemic and started driving to a place where I had no convenient l2 charging but very convenient supercharging -- a supercharger near a supermarket. After several months of mostly supercharging and driving the car from 90% to 15% regularly, the battery seemed ... mostly the same. I rarely / never charged it even to 90% on the supercharger (usually would pull it off around 70% when the charge rate decreases substantially). I'd rarely / never let SOC get below 15% and didn't push it when at low SOC.
Very recently, we ended up driving the car pretty hard with a somewhat low SOC, to the point that a couple times the "limited power output" triangle showed up on the power / regen meter. I'm used to seeing it when it is cold, and I've also occasionally seen it as a limit when *very* cold, but never seen it due to low SOC. When we parked (with about 5% SOC) the car estimated that the pack had a maximum capacity of 236 miles at 100% (vs the typical 277...). After charging for a while it bounced back, mostly...
But since that last trip the battery's been charging at best to 248(90%) or 274(100%) though sometimes it'll guestimate that it can charge all the way up to 249.
Now -- the 1% difference is basically nothing relative to how I use the car, and it is possible that all the supercharging I'd been doing contributed to the wear and I hadn't really been keeping track (boo, not using teslafi), but it seems like there might also be a relationship between wear and how the car is driven at high and low SOC.
Thoughts?
...I don’t know how many threads I have read on subject of battery degradation over the years here on the forums ..but no one knows definitively how the bms works etc ...
