Battery Health Check
Combines SoH, capacity, cell balance, temperature, voltage and vehicle-specific values into an A-F grade with a full score breakdown.
Professional EV battery diagnostics
Ev Analyzer See what your battery is really doing.
Cell-level health, controlled load tests, charging, thermal and fault analysis from a simple ELM327 adapter. The kind of insight normally found in costly specialist diagnostics, in one free Android app.
Free forever
No ads
No subscription
Local by default
Built by an independent developer
1,000s
of real-world beta datapoints
20+
supported EV models
12,000+
manufacturer-aware DTC definitions
$0
and absolutely no advertising
Beyond a single SoH number
A one-of-a-kind EV diagnostic toolkit.
Ev Analyzer turns raw vehicle data into a clear answer for everyday drivers and serious evidence for people who want to go deeper.
Start with a simple A-F battery grade, confidence score and plain-language explanation. Then inspect the exact signals behind it: every available cell, voltage sag, pack resistance, heat, charging performance, recurring weak cells and more.
- 01Connect a Bluetooth or WiFi ELM327 adapter
- 02Choose your vehicle and run a guided test
- 03Get a clear result with the underlying data attached
A complete test suite
One adapter. Serious answers.
Guided workflows make every test approachable. Quality scores and confidence levels show when the data is strong enough to trust.
Real Load Testing
Measures voltage sag, current step, power and recovery under controlled load, then estimates pack resistance and test quality.
Cell Intelligence
Inspect every available cell and track spread across state of charge. Repeated testing reveals persistent weak cells, not just temporary imbalance.
Charging Analysis
Record SoC, power, temperature, energy added, duration, peak power and efficiency across AC and DC charging sessions.
Thermal and 12V Tests
See how the traction battery heats under load and cools afterward. Check 12V resting voltage, load drop, recovery and DC/DC regulation.
Faults and Adapter Quality
Read stored, pending and permanent DTCs. Verify adapter identity, protocol behavior, supply voltage and ECU response before deep scans.
Real screens. Real measurements.
Complex data, made readable.
Live Dashboard
Power flow, energy, temperatures and essential vehicle data at a glance.
Health Score
A-F grading with confidence, score breakdowns and a complete snapshot.
Battery Load Test
Grade pack response under controlled load with cell spread, peak current and test confidence.
Battery Run Analysis
Track cell spread across SoC to expose weaknesses that appear as the battery empties.
Cell Voltage Map
Every available cell on a fixed scale, with exact deviation from average.
Weak Cell Tracking
Separate recurring problem cells from a temporary imbalance.
Charging Monitor
Follow power, temperature, energy, peak values and efficiency live.
Light Theme Available
Prefer a brighter interface? Switch the entire app to a clean light theme whenever dark mode is not for you.
12V and DC/DC Test
Check reserve, voltage drop, recovery and converter regulation in one guided test.
Deep Live Data
Inspect the raw detail whenever the summary is not enough.
Multi-ECU Diagnostics
Scan faults with severity, manufacturer-aware explanations and practical next checks.
Session History
Keep diagnostics local, reopen complete results and review detailed charts over time.
Not just another code reader
Workshop-depth analysis without the workshop bill.
Basic OBD apps show values. Ev Analyzer connects those values, tests the battery under real conditions and explains what the result means.
| Capability | Basic OBD app | Ev Analyzer |
|---|---|---|
| Battery condition | A single reported SoH value | Multi-signal A-F grade, breakdown and confidence score |
| Cell problems | Current values, when available | Cell map, SoC spread and persistent weak-cell tracking |
| Load behavior | Live voltage and current | Guided load test, sag, recovery, resistance and quality |
| Charging | Live charge power | Sessions, energy, temperature, peaks and efficiency |
| Evidence | A screen of numbers | Local history and visual PDF diagnostic reports |
| Privacy | Accounts, analytics or cloud history | Local by default. No tracking or data harvesting. |
| Price | Paid tiers or advertising | Free. No ads. No subscription. |
Private by architecture
Your vehicle data stays on your phone.
No account, no analytics and no advertising profile. Scans, saved sessions and reports are processed and stored locally by default.
-
01
Community Comparison is opt-in
It is off by default. Only sanitised, pseudonymous battery measurements are contributed when you choose to enable it.
-
02
PID Probe sharing is your choice
Probe results leave the phone only when you choose to submit them to help the developer add and improve vehicle support.
-
03
Diagnostic logs are never sent silently
An OBD2 communication log is shared with the developer only after you explicitly confirm the submission.
Nothing is sold. Core diagnostics work without cloud sharing.
1,000s
of datapoints from real EVs
Refined in the real world
Built with drivers, not just assumptions.
The closed beta contributed thousands of datapoints from real vehicles, battery packs, charging sessions and controlled load tests. That evidence helped refine the analysis into a professional diagnostic experience that is unique in its class.
Growing vehicle support
Built for the EVs people actually drive.
Vehicle profiles unlock model-specific battery signals, while standard OBD2 diagnostics cover a wider range of vehicles. Advanced PID Probe tools help discover support for more models.
- Nissan Leaf
- Hyundai Ioniq
- Hyundai Ioniq 5
- Hyundai Kona
- Kia EV6
- Kia e-Niro
- Kia Soul EV
- Chevrolet Bolt
- BMW i3
- VW ID.3 / ID.4
- Audi Q4 e-tron
- Skoda Enyaq
- CUPRA Born
- Renault Zoe
- Peugeot e-208
- Opel Corsa-e
- Citroen e-C4
- Volvo XC40
- Polestar 2
- Ford Mustang Mach-E
- MG ZS EV
- Standard OBD2 EVs
Available measurements vary by vehicle, model year, ECU access and adapter quality.
About the developer
Why make it free?
Because understanding an EV battery should not require specialist access, expensive software or a wall of unexplained numbers.
Whether you are buying an EV, selling one, or simply trying to understand the car already in your driveway, the battery matters too much to remain a mystery. Many existing apps are built around a single model. Others expose plenty of raw data but make it difficult to see what actually matters.
I am building Ev Analyzer as the missing middle: a clear first answer for anyone, with professional-depth evidence for those who want to dig deeper. It is a one-person project shaped by real vehicles, voluntary anonymous comparison data, PID discoveries, testing and direct driver feedback. Every contribution can make the next diagnosis clearer for someone else.
Ev Analyzer is free and will stay free. No ads, no subscriptions and no data harvesting. This kind of tool is needed, and until now it has not existed in this form.
- Free forever The useful diagnostics are not hidden behind a subscription.
- Independent Built by one developer for drivers, buyers, sellers and workshops.
- Community-driven Voluntary real-world data and feedback help support more EVs over time.
Your car. Your battery. Your data.
Professional insight should not be a luxury.
Connect your adapter and start with a clear battery health check today.
Get Ev Analyzer free →