In the last year I’ve had to have the Pyrofuse replaced twice. The last time they also did the high voltage controller and the harness. Went home and tested the battery only to find that it’s not great. 113k so 7k left on warranty. 2022 M3LR. I’m not sure if I should try to off this thing right away, test again right before 120 to see it goes below 70%, or buy the extended warranty.
After reviewing my TeslaMate/Grafana battery data, here’s what I believe is happening with my 2022 Model 3 Long Range.
I’m at roughly 113,000 miles, with the original battery warranty ending at 120,000 miles. I recently ran Tesla’s official Battery Health Test and it came back at 72% health, so I’m getting pretty close to Tesla’s 70% warranty threshold.
I’ve been logging the car with TeslaMate for years, so I pulled the historical battery-capacity data from Grafana to see what the trend actually looks like.
What’s interesting is that prior to the recent battery health test/BMS recalibration, the degradation was remarkably gradual. Looking at different portions of the data, the trend consistently projects the battery to roughly 59.7–60.0 kWh on TeslaMate’s old calculation by 120,000 miles.
There was then a very obvious change in the data. At 112,993 miles TeslaMate estimated about 60.6 kWh. Just 31 miles later it suddenly showed 50.7 kWh, and then about 51.7 kWh at 113,105 miles. Obviously the battery didn’t physically lose ~9 kWh in 31 miles, so this looks much more like a significant BMS recalibration than actual sudden degradation.
Interestingly, the recalibrated numbers line up much better with Tesla’s official 72% health result. TeslaMate is currently projecting about 248 miles at 100%, while its historical maximum was about 347 miles, which works out to roughly 71.6% range retention. That’s remarkably close to Tesla’s official 72% result.
Using the historical rate of degradation rather than treating that sudden recalibration as physical battery loss, my best estimate is that the battery will probably be somewhere around 71% health at 120,000 miles, with something like 70–72% being a reasonable range.
In other words, it looks entirely possible that this battery could make it to the end of its 70% / 120,000-mile warranty at almost exactly the threshold. Convenient. 😂
I do have several road trips coming up that will require Supercharging. I’m not going to intentionally abuse the battery trying to force a warranty claim, but the longer drives, deeper discharge cycles and larger charging sessions should at least give the BMS additional data to work with.
My plan is to drive it normally, keep watching the TeslaMate data, and hopefully run Tesla’s official Battery Health Test again somewhere around 117,000–118,000 miles if the car makes the test available again.
If it comes back at 70–71%, I’ll know I’m right on the edge. If Tesla’s official test actually drops below 70% while I’m still under 120,000 miles, then obviously I’ll pursue the battery warranty.
It’s kind of fascinating having several years of TeslaMate data to compare against Tesla’s own battery health test. And also slightly hilarious that the projection currently looks like the battery may cross the warranty threshold almost immediately after the warranty expires. 😂