Battery degradation is the reason people give for not buying an electric car.
It deserves a real answer with real numbers, including the parts that are still unknown.
Odometer 22,918.1 miPer mile 12.9¢Degradation 0%On FSD (Supervised) 94.5%Snapshot 2026-10-06, baked at deploy. This page makes no live requests.
Measured degradation
0%
Usable capacity reads 79 kWh against an original
79 kWh at 114 cycles. TezLab rates the pack
excellent and puts degradation in the low band and cycle count in the
average band for comparable cars in the region.
Two readings are not a trend
0% at 22,918 miles is a real measurement, and it is
one of two. TezLab returns no capacity history for this car yet.
So the timeline is being built here instead, one reading every Monday.
Twelve of them make a story. That is two so far.
79kWh
Usable capacity
114
Battery cycles
96/100
Recurrent Range Score
310Wh/mi
Real consumption
Range lost while parked
Phantom drain is the cost of owning the car on days you do not drive it. Over
42 days this pack gave up 283 miles of
range sitting still, an average of about
7 miles a day.
10/05
Miles265.3 mi
Drives33
On FSD (Supervised)99%
Efficiency100%
Idle loss3.9 mi
Charged69.5 kWh, $28.52
measured. Miles of range lost while parked, day by day, against the dashed
42 day average. The worst day is 25 August, 22.7 miles. A day
with no column has no reading. At 41.7¢ a kWh and
310 Wh a mile, 283 miles of lost
range is roughly
$36.57
of electricity. modeled, because the drain is measured in range and converted to dollars here.
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 114 cycles and
0% measured loss, that floor is a long way off. The basic vehicle
warranty runs to 2028 or 50,000 miles.
Not here yet
TezLab returns null. Built locally from one reading per Monday. Once there are enough Monday
readings to plot, the chart replaces this note.
measured invoice or sensormodeled derived, and says soPulled 2026-10-06 · VIN serial masked · no addresses
Follow the miles
Every week’s miles, charging and cost per mile, straight from the car, in the feed.
