EIS Direct Drive
See inside the battery without taking it out of service.
Multi-Model Electrochemical Impedance Spectroscopy (EIS) reads a battery’s electrochemical response and compares it with proven models to classify capacity and assess state of charge, power capability, and anomalies.
The result is a fast, non-invasive view of battery condition that helps teams act before weak batteries interrupt operations.
30 sec
Typical test time
3–48 V
Spectro Modular range
Up to 300 Ah
Supported capacity
≥300 µΩ
Battery resistance
How it works
From electrochemical signal to a service decision
Instead of relying on a heavy discharge test, Multi-Model EIS analyzes the battery’s response across frequencies and finds the closest match in a library of battery models.
Excitation
Spectro™ applies controlled sine-wave signals and records the battery’s electrochemical response.
Modeling
The resulting Nyquist signature is compared against matrices built from batteries at known health conditions.
Decision
The models translate complex evidence into capacity, state of charge, power capability, and anomaly insights.
Battery condition, made visible
One test reveals more than a voltage or cranking check.
A battery can look identical when it is full, empty, or near end of life. Multi-Model EIS adds the condition data needed to distinguish between them.
State of energy
Capacity indicates remaining useful runtime.
State of power
Resistance helps validate the ability to deliver power.
State of charge
Available charge supports mission and shift readiness.
State of safety
Electrochemical anomalies can flag batteries for closer review.
The leading health indicator
Power can look strong while capacity fades.
A cranking or resistance check shows whether a battery can deliver power now. Capacity shows how long it can continue doing useful work.
By classifying capacity alongside state of charge and resistance, Multi-Model EIS helps establish Minimum Operational Reserve Energy (MORE). This is the point where reliability, service timing, and battery economics meet.
Minimum Operational Reserve Energy
Set the reserve your operation needs.
Minimum Operational Reserve Energy (MORE) defines the lowest acceptable battery capacity for a specific application. It creates a practical service threshold between using a battery fully and replacing it before reliability is at risk.
Multi-Model EIS classifies capacity without a full discharge, allowing Spectro™ to compare each result with the selected MORE target and return a clear service decision.
01
Set
Choose the reserve-energy target for the application.
02
Assess
Classify capacity non-invasively.
03
Act
Keep, service, or replace before failure.
40%
Starter batteries
50%
Heavy-duty vehicles
60%
Mobility and standby
Example targets shown. The appropriate MORE setting depends on the application.
Where it fits
One technology, multiple battery decisions
Use Multi-Model EIS in the field, in quality control, or as part of a connected battery-management system.
Fleet and field service
Assess starter, deep-cycle, and standby batteries without a full discharge. Find weak units, compare batteries in a string, and plan replacement before failure.
Explore Spectro™ ModularManufacturing and quality
Overlay Nyquist signatures, define acceptance fields, compare production batches, inspect incoming batteries, and support warranty analysis.
Explore Spectro™ ExplorerBMS, UPS, and energy storage
Integrate compact EIS measurement into a battery-management system to add capacity estimation and electrochemical anomaly detection.
Discuss OEM integrationPut the evidence to work
Choose the right Multi-Model EIS path for your batteries.
Start with a field-ready Spectro instrument, develop a battery matrix, or discuss embedding the technology into your BMS.