# Fiat 500e battery diagnostics

A read-only tool that reads a 2013–2019 Fiat 500e's battery controller through the OBD port, with an OBDLink EX adapter and a laptop.

- All 97 cell voltages, live, and how each compares with the pack.
- True charge against what the dash shows, pack current, and 18 battery temperatures.
- Capacity against new (the battery's health), from the controller's own figures, checked against measured charging and driving.
- Fault codes from every module, the modules' service history (programming dates), recalls.
- An exportable battery and history report, a drive and charge recorder, an overnight 12 V logger.
- Read-only by design: it never writes to the car.

To try it on your own car you need a 2013–2019 500e, an OBDLink EX adapter (about $80) and a Mac.
Source and setup: https://github.com/eloquentix/fiat-500e-battery-health
Demo (simulated data): https://apps.eloquentix.com/fiat500/
Made by Eloquentix (https://eloquentix.com). Contact: info@eloquentix.com