jason98 said:
All right, 100+ is official and so am I officially pissed and have nothing left to do but having to schedule a service for what I call a serious under-mileage of the battery pack.
Definitely schedule the service; there is obviously something wrong with your car. But don't try to diagnose it yourself. "Under-mileage of the pack" doesn't fit what you show, since you haven't lost any pack capacity bars. What you have is an error in at least one of four different values shown: miles driven; miles/kWh; state of charge; battery capacity.
You probably know how far you have gone, or can double check in a mapping program, so you can eliminate that.
Your miles/kWh is extremely high, but possible if you are a hypermiler. Again, you know how you have been driving it.
Dropping SoC bars like that should only happen if you are driving 80+ mph or stuck in a traffic jam on a sub-zero night. Since you are in the Bay Area and our temps right now are balmy, it isn't the latter. Besides, that puts the lie to miles/kWh. But the error might be in something like a battery voltage sensor, so the BMS only thinks the SoC is dropping rapidly when it really isn't. Unfortunately, the end result is likely to be the same: the system will force a shutdown when it sees too low a voltage, no matter how much energy the battery really still has.
The last case is perhaps the most troubling: What if the battery really is failing, due to a manufacturing defect, but the capacity gauge says it is still in perfect shape? You take it in, and the repair shop points at that capacity gauge, and tells you you are imagining things. The car says the battery is doing fine. The worrisome part here is that the logic for calculating and displaying battery capacity may not have been as well debugged as most of the other systems in the car. Sure, they will have run simulations, but how many actual accelerated battery degradation tests have they had a chance to run with the final version of the firmware? Don't let the repair shop put you off; insist that they run their battery of tests.
Ray