FAQ
Straight answers about the score.
What Ionscore measures, how it is produced, and how honest the numbers are, answered plainly. Every accuracy figure traces to the published model card.
What is battery state of health (SoH)?
- State of health is a battery's present usable capacity as a share of its original capacity, expressed as a percentage. It falls as the pack ages, and it is the single number that says how much life a used EV battery has left. Two packs of the same age and odometer can be years apart in state of health, and nothing on the outside shows it.
How does Ionscore score a battery?
- Ionscore reads observable BMS telemetry, equivalent full cycles, temperature exposure, an internal-resistance proxy, coulombic efficiency, depth of discharge, fast-charge fraction, calendar age, climate, chemistry, and segment, and predicts a calibrated P10, P50, and P90 state-of-health band with gradient-boosted quantile regression. The estimator never observes the true state of health; the band is then calibrated on held-out packs so its uncertainty is measured rather than asserted.
How accurate is Ionscore's model?
- On a held-out set of 149 packs, the estimator's state-of-health mean absolute error is 1.58 percentage points, and its P10 to P90 band covers 80.0 percent of the hidden truths (target near 80 percent). These figures are measured on synthetic fleets grounded on public battery aging data, so the realism ceiling is the simulator's, not field telemetry's. The value of the published model card is the method and the honest calibration, not a field benchmark.
What is second-life or residual value?
- When an EV battery no longer meets its first-life duty, its remaining capacity can still be worth money for resale, refinancing, or repurposing into stationary storage. Second-life value is that remaining worth. Scoring the pack's state of health is what lets a lender, insurer, fleet, or refurbisher price it instead of guessing on age and odometer alone.
Does Ionscore need OEM access or a manufacturer's black box?
- No. Ionscore is cross-OEM: it reads the signals every compliant pack already emits under India's AIS-156 battery-safety standard, so it is not locked to any one manufacturer's black box, and it publishes its error bars. Ionscore is a data and scoring layer. It does not lend, insure, trade certificates, or recycle.
Are Ionscore's published metrics from real or synthetic data?
- Synthetic, and stated as such. The current model card is measured on synthetic fleets grounded on public battery aging data. The simulator keeps a hidden latent state of health that the estimator never sees, the train and test split is by pack so no pack appears in both, and the band calibration is reported honestly rather than assumed. The claim being made is the method, not a field benchmark.
Who is Ionscore for?
- EV lenders, insurers, fleets and OEMs, and refurbishers, anyone who has to price, finance, insure, or retire a used battery. It is India first, built on top of the AIS-156 telemetry mandate, the Battery Waste Management Rules, and the used-EV fleet that PM E-DRIVE is putting on the road.
What does an Ionscore pilot involve?
- A pilot scores a sample of your packs end to end: calibrated state of health, value, and risk, with the same published error bars shown on the methodology page. It is a scoped run on your own fleet or portfolio, not a generic demo.
Still have a question about your book?
A pilot scores a sample of your packs end to end: calibrated state of health, value, and risk, with the same published error bars.