EVCare
The method
How do you turn a battery into one honest number?
Health is many things at once. A single number has to respect that.
One reading lies
A single measurement can flatter a tired pack.
Health isn't one thing — it's several, pulling in different directions.
The signals we read
Capacity
how much it holds
Resistance
how hard it pushes back
Temperature
the heat it has seen
Usage
how it was charged and cycled
Why not just average
A plain average
  • One weak factor hides
  • behind strong ones
  • Health looks better than it is
The honest way
  • The weakest link
  • pulls the score down
  • No hiding a real problem
The weakest link wins
Same factors, two methods
Plain average
82
Weakest-link score
68
Not all equal
Weighted for what matters
  • Safety-critical signals count for more
  • Minor factors count for less
  • The weighting is fixed and explainable
Reading the bands
70+
Healthy · good to go
40–69
Watch · plan ahead
Below 40
Act · intervene
The three layers
CareStar™
the electrochemical engine
BattHealthScore™
one composite health number
FitStar™
ready for today's route?
One honest number
76
/ 100
Comparable across vehicles, and fully explainable line by line
One number. Fully explainable.
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