I've got a March 2016 S90D (pre facelift, non-performance); I've had it for 8ish months and 7000 miles. In the time that I've had it I've seen the battery slightly improve in "rated" capacity.
When I first got the car, it had at most a rated range of 276; I filled it almost all the way up once and otherwise was careful to keep the charge below 80%.
Lately I've given up on nannying the car -- if I wear out the battery so be it; I've got access to a free charger at work (30a/208v) so I often (at least once a week) charge the car to the point where it starts throttling the amperage. I will take it right off the charger and start driving it, and typically drive it enough after to get it down to 90% before I park it for long periods of time. I have occasionally let it get down to 100 miles of range (35-40%ish) but that's uncommon. I never charge it overnight.
In the time that I've switched from "good hygiene" to "bad hygiene" I've seen that the rated range has gone from 272-276 to 277-280 according to the guessometer. This morning it reported before charging that 100% would be 272, but once on the charger the 100% went to 275 the 277 then 280 and that's where it's stayed for the rest of the charging session. The throttling, too, seems like it has come later and later in the charging sessions, where at first it'd throttle back to 20a at even 92%, now it seems to go up to 95% before it starts to throttle back. In fact, for the first time ever, the esti-meter is saying that 100% is 281...
Over the winter I didn't drive it long distances, but the rated range was somewhat accurate relative to highway driving (it says I can go 250 miles, I easily drive 200 miles and have some cushion remaining, etc).
Is my filling it to near the top often relatively often helping the BMS calibrate the true remaining range / balance the cells to a degree not seen in cars that never brush against the top?
When I first got the car, it had at most a rated range of 276; I filled it almost all the way up once and otherwise was careful to keep the charge below 80%.
Lately I've given up on nannying the car -- if I wear out the battery so be it; I've got access to a free charger at work (30a/208v) so I often (at least once a week) charge the car to the point where it starts throttling the amperage. I will take it right off the charger and start driving it, and typically drive it enough after to get it down to 90% before I park it for long periods of time. I have occasionally let it get down to 100 miles of range (35-40%ish) but that's uncommon. I never charge it overnight.
In the time that I've switched from "good hygiene" to "bad hygiene" I've seen that the rated range has gone from 272-276 to 277-280 according to the guessometer. This morning it reported before charging that 100% would be 272, but once on the charger the 100% went to 275 the 277 then 280 and that's where it's stayed for the rest of the charging session. The throttling, too, seems like it has come later and later in the charging sessions, where at first it'd throttle back to 20a at even 92%, now it seems to go up to 95% before it starts to throttle back. In fact, for the first time ever, the esti-meter is saying that 100% is 281...
Over the winter I didn't drive it long distances, but the rated range was somewhat accurate relative to highway driving (it says I can go 250 miles, I easily drive 200 miles and have some cushion remaining, etc).
Is my filling it to near the top often relatively often helping the BMS calibrate the true remaining range / balance the cells to a degree not seen in cars that never brush against the top?