Battery degradation is the reason people give for not buying an electric car.
Here are the numbers.
The battery, at a glance
100%of its new capacity
Usable capacity 79 kWh on one reading.
Used121 cycles24,260 miles on the odometer
One reading79 kWhat 121 cycles
While parked347 milesof range lost standing still, in 56 days
Odometer 24,260.3 miPer mile 12.1¢Battery 79 kWh on one readingOn FSD (Supervised) 95.3%As of October 20.
Measured on one reading
79 kWh
Usable capacity reads 79 kWh at 121 cycles, on one reading. A second dated reading is needed before any change can be shown.
Warranty, the good news
The battery and drive unit are covered to 2032 or 120,000 miles,
whichever comes first, with a floor of 70% capacity retention. At 121 cycles and
79 kWh on one reading, that floor is a long way off. The basic vehicle
warranty runs to 2028 or 50,000 miles.
79kWh
Usable capacity
121
Battery cycles
96/100
Recurrent Range Score, September 3
293Wh/mi
Real consumption
Range lost while parked
Phantom drain is the cost of owning the car on days it is not driven. Over
56 days this pack gave up 347 miles of
range sitting still, an average of about
6 miles a day.
10/19
Miles126.6 mi
Drives13
On FSD (Supervised)99%
Efficiency107%
Idle loss2.4 mi
Charged29.3 kWh, $11.70
measured. Miles of range lost while parked, day by day, against the dashed
56 day average. The worst day is August 25, 22.7 miles. At 41.3¢ a kWh and
293 Wh a mile, 347 miles of lost
range is roughly
$42.02
of electricity. modeled.
What it did while parked
160 min climate
4 min Sentry Mode
0 min cabin overheat protection
0 min battery heater
measured: 5 charge cycles, October 9 to October 19. A cycle runs from one charge to the next.
measured invoice or sensormodeled derived, and says soPulled 2026-10-20 · VIN serial masked · no addresses
What happens next
Want to follow the next project?
Everything here started as a what-if and became a record. The crew hears the day the next one opens.
One more step
Check your inbox.
One click confirms your address, and a note with where to start follows. While you wait, this is the place for you:
