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Range Loss Over Time, What Can Be Expected, Efficiency, How to Maintain Battery Health
- Thread starter KK_RedM3
- Start date
It will affect it, but how much varies. There are several good threads on this beside the sticky post in the Battery section of the forum.
Supercharging only is that an option?
Getting by with only supercharging
Purchasing a M3 that's only been supercharged
Supercharging only is that an option?
Getting by with only supercharging
Purchasing a M3 that's only been supercharged
SageBrush
REJECT Fascism
MarsOrBust
Member
I normal just keep my charge at 80% but sometimes I go a few days without driving. Should I leave it plugged in the entire time?
It won’t hurt, but I never worry about plugging my car in unless I need to charge it.
Further discussion in these threads:
What Phantom Drain??
Power use while plugged in but not charging
Further discussion in these threads:
What Phantom Drain??
Power use while plugged in but not charging
XLR82XS
D M C
UncertainTimes
Active Member
AlanSubie4Life
Efficiency Obsessed Member
This does not seem possible. You’d have to show a picture demonstrating this. The max at 80% for 2020 3P would be 258 miles when 18” wheels are selected, and typical (highest possible) for a brand new Performance 2020 with 20” wheels would be 239 miles. (80% of 299)
Which wheels do you have selected?
If you have 20” selected on the touchscreen, then you have about 7.5% capacity loss, which is on the higher side, but quite typical, and how much of an outlier this is will depend on mileage and the vehicle age (9 months). Basically it sounds pretty normal, on the high side. But well within the typical distribution.
If you have 18” wheels selected on the touchscreen, this 221 miles would be 14% capacity loss (258rmi18@80% when new), which would be very high.
AlanSubie4Life
Efficiency Obsessed Member
Not really for a March delivery, unless somehow your car had really old software at delivery. The 2020 initially (in late 2019) had 310 miles at 100%, which shortly thereafter changed to 299 miles at 100% with no degradation (same range, same capacity, just 299rmi20 rather than 310rmi - which are the same energy & range) with a software update. So that would be 279 and 269 at 90%. Those would both be perfect numbers, assuming 20" wheels are selected for the 269 number.
(Aside: It's actually possible the 299rmi20 is higher range than the 310rmi, since that software update may have been concurrent with an efficiency improvement - have to review the webpages that document all of that to align everything and see, but it doesn't matter, for assessing battery capacity loss, which is what we care about here. As I recall that efficiency improvement (the second such improvement as I recall) was closely matched in timing to the release of the "hold" driving mode.)
So, for reference, 239rmi20 @ 80% is a perfect result for a 2020 Performance.
So that means as of four months ago you had nearly zero degradation (assuming you had 20" selected). It's not unusual for capacity loss to show up suddenly. Also, in Gig Harbor, note that chilly temperatures will have a small effect on your rated miles, because a cold battery simply does not contain as much available energy. Best to do these assessments after Supercharging from 5% to 80-90%.
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AlanSubie4Life
Efficiency Obsessed Member
Added to my post above. I think it's likely you have some capacity loss (normal!), but a small portion of this discrepancy from the "expected" 239 rated miles is pack temperature. Try Supercharging from 5% to 80-90% and then immediately look at the value.
AlanSubie4Life
Efficiency Obsessed Member
It's in the service menu. Also you can just see it on your car avatar. Note the proper wheels to select are the ones that you happen to have on your car. If you have winter tires with decent rolling performance, it might be better to select 18" or 19". But that's an aside, has nothing to do with capacity. For assessing battery health, we just need to know what you currently have selected (I think it's basically 100% certain you have 20" selected assuming you don't have a Stealth). You don't need to change it. The selection on the touchscreen doesn't affect your range - your installed wheels and tires do. The selection does affect the Trip Planner projections and the displayed rated miles. But that has nothing to do with range. 299rmi20, 304rmi19, and 322rmi18 are all the same range (it's actually energy, not range), all else being equal (in particular, wheels and tires must be equal).
Just remember "rmi" are a measure of energy, not distance. That's the key. Has only a very loose correlation with distance.
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