EV Battery Health & Behavioral Diagnostic Workbench
Grounding Engadget's reporting: EV traction packs rarely fail in a single event. Degradation manifests in behavioral anomalies—unusual voltage drop on throttle demand, phantom overnight drain, aggressive range compression, and high DC fast-charge cycle wear.
Pack Behavioral Telemetry
Live Parameters
Nominal Pack Capacity
75.0 kWh
Nameplate original gross capacity rating.
Battery Calendar Age
4.5 yrs
SEI layer growth and baseline temporal calendar aging.
Voltage Sag Under Load
18.5 V
Transient bus voltage drop during peak acceleration (internal resistance).
Phantom Overnight Drain
3.2 %/day
BMS parasitic draw and micro-short self-discharge while parked.
DC Fast Charge Frequency
5 /wk
High C-rate charging causing dendrite stress and localized heat.
Observed Range Compression
22.0 %
Realized reduction in EPA baseline range under normal climate.
Diagnostic Computation
AUDITED PROOF STATE
Degradation Index
42.8%
Compound behavioral wear
Effective Capacity
42.9 kWh
Retained usable energy
State of Health (SoH)
57.2%
Relative to 75.0 kWh
Simulated 8-Year Wear Trajectory
Nominal vs Behavioral Degradation
Telemetry Degradation Contribution Breakdown
| Telemetry Metric | Observed Signal | Degradation Delta | Status |
|---|
Source Grounding: Based on automotive reporting from
@engadget:
"EV batteries usually fade gradually, so the real warning signs are often changes in behavior rather than age alone."
This workbench quantifies those behavioral shifts (internal impedance sag under acceleration load, accelerated overnight phantom drain, rapid DC fast-charging stress, and observed range compression) into an authoritative replacement diagnostic.