What kind of lifetime do people assign Tesla's current-day packs?
It certainly seems like, based on the 450k mile "Tesla Taxi"'s experience, assuming no faults, they're certainly good for ~300k but that's just one data point (and of course they had a faulty battery, too).
IIRC the warranty on my Model 3 pack is for >70% retention after 8 years/100k miles, but in real world experiences, they don't seem to degrade much past the first 10k miles. We're over 30k miles and the life is basically exactly what it was at 10k.
But I don't know what the commonly-expected "pack lifetime" is. I have seen the owner surveys out to 100k-150k miles and the lifetime still looks good at that point. And of course they've been through a lot of revisions over the years.
I'd like to know the strategy for maximizing lifetime. If typical use is about 30 miles per day that leaves a lot of room for strategizing. Should I charge it every night, every other night or every third night? Should I keep it charged to 80% all the time, or should I let it go down to some minimum level first before plugging in?
Keep it above 40% and below 80% and you should be good. The damage is mostly done during charging so setting your max level to 80% and leaving it plugged in is about the best way to go.
The main thing to look at is the floor. Keep the battery from going too far below 40%. (I believe past 20% is where damage really starts to happen).
Other tips to keep the battery happy are things like driving slower, using chill mode, etc. Fast discharges damage the battery so eco driving is usually good for the battery.
AFAIK, LiPoly batteries don't really suffer from any sort of memory effect. So there is no harm in not fully discharging. The one catch is that your BMS can get out of whack if it doesn't see 10% and 90% for a while. So occasional charges up to 90% or 100% are not a bad thing to recalibrate the BMS.
It certainly seems like, based on the 450k mile "Tesla Taxi"'s experience, assuming no faults, they're certainly good for ~300k but that's just one data point (and of course they had a faulty battery, too).
IIRC the warranty on my Model 3 pack is for >70% retention after 8 years/100k miles, but in real world experiences, they don't seem to degrade much past the first 10k miles. We're over 30k miles and the life is basically exactly what it was at 10k.
But I don't know what the commonly-expected "pack lifetime" is. I have seen the owner surveys out to 100k-150k miles and the lifetime still looks good at that point. And of course they've been through a lot of revisions over the years.