Model 3 Performance Battery Degradation One Month (Story)

[HyperionMark]

+1 to the above.

I highly recommend just setting everything to percentage so you don't even see the mileage number.

 

[golfpilot]

I just hit 20k miles. Mine charges to 295 full charge. It was 305 100 miles ago. I think it’s more of a balancing thing than an actual degradation thing

 

[brandonee916]

My range reports 305 and I have 12k, that said, switching the display to percentage has been the best thing I've done ;-)

 

[gzerninplatz]

I think it is the sudden drop that get to folks - it was to me. And surely some of those drops are actually battery issues...I lost 15 miles (down to 290) essentially overnight, a few weeks after getting the car....the quick "charge to 100% and then let it go down really low a few times" thing had no effect...but by avoiding the dreaded 60-80% charge level, perhaps aided by getting a few firmware upgrades (probable algorithm changes), I'm back up to 304 on an extended range dual motor..

 

[Jedi2155]

I heard that the drop in range from like 310 to 300 is a software thing that happened in the most recent update and it has affected most people. Whether its a SW bug OR a more accurate representation remains to be determined.

I also dropped from 307/308 to 300 all of a sudden. This is with 80% supercharging.

 

[gzerninplatz]

Charging between 60-80% is well known to kill indicated range

 

[hcdavis3]

Charging between 60-80% is well known to kill indicated range

Really? Jeff Dahn battery guru says 70 percent is ideal.

 

[zhu-]

Really? Jeff Dahn battery guru says 70 percent is ideal.

Yes it's ideal for the health of the battery, but it throws off the system's calculations of estimated miles.

 

[hcdavis3]

Yes it's ideal for the health of the battery, but it throws off the system's calculations of estimated miles.

Oh thanks for the clarification. That’s very informative. What percentage do you use, just curious.

 

[zhu-]

Oh thanks for the clarification. That’s very informative. What percentage do you use, just curious.

I normally charge to 90%, there's a bit more power at that SOC vs 75% or lower.

 

[hcdavis3]

I normally charge to 90%, there's a bit more power at that SOC vs 75% or lower.

Thanks very very much zhu. I like the more power. I’m going on your recommendation.

 

[zhu-]

Thanks very very much zhu. I like the more power. I’m going on your recommendation.

I believe the battery degradation is only very slightly worse and Elon suggested the 90% himself as a good overall balance

 

[hcdavis3]

I believe the battery degradation is only very slightly worse and Elon suggested the 90% himself as a good overall balance

You know zhu I should stay off the forums and just enjoy the car. But I’m obsessed with data. Teslafi is making me nuts.

 

[UltralightBeam]

Charging between 60-80% is well known to kill indicated range

What would be the proper 'corrective' procedure to bring things back to normal? How long does this usually take?

 

[MP3Mike]

What would be the proper 'corrective' procedure to bring things back to normal? How long does this usually take?

Charging to 90% daily will normally fix it in a short period of time. In some cases on the Model 3 charging to 70% daily for a while caused it to get so far out that Tesla had to perform a "reset" on the battery to get it estimating range properly again. They may have updated the BMS since then so that it doesn't happen, or it recovers more gracefully.

But the lesson is that Tesla designed, and tested, the system to normally be charged to 90%...

 

[UltralightBeam]

Would you say that charing it to say 95% once a week would actually mess it up more or is the 90% a 'rigid' number for this that's somehow coded into the BMS?

 

[MP3Mike]

Would you say that charing it to say 95% once a week would actually mess it up more or is the 90% a 'rigid' number for this that's somehow coded into the BMS?

Elon has said to charge to 95% if you need it, but general recommendation is 90%. I think charging to lower SoCs cause more of an issue than charging to higher SoCs.

 

[EVDRVN]

Elon has said to charge to 95% if you need it, but general recommendation is 90%. I think charging to lower SoCs cause more of an issue than charging to higher SoCs.

I have not yet learned how to charge to a low SOC so I guess my pack is ok

 

[ngogas]

For folks who maybe wondering though, just make a quick appointment and have sc do a quick battery check. They can run to make sure your car don’t have any recall and make sure the battery is ok for peace of mind. That is what warranty is for.

 

[HyperionMark]

For folks who maybe wondering though, just make a quick appointment and have sc do a quick battery check. They can run to make sure your car don’t have any recall and make sure the battery is ok for peace of mind. That is what warranty is for.

I would recommend not doing this. The service department is already way over stressed. We don't need to bother them for a little peace of mind when their shouldn't be any worry in the first place. I would feel bad pushing back the appointment time for someone needing actual service.