RE: nPM1300 Fuel Gauge Profiling: Generic .inc files, hardware requirements, and PPK2 alternative?

Tharaka — Mon, 23 Feb 2026 07:47:12 GMT

Hi

1. For the best accuracy, we strongly recommend profiling the actual battery used in your end product. This ensures stable performance under your device’s real load and temperature conditions.

Generic battery models can be used for early evaluation, but they will not deliver the same stability as a custom‑profiled model. The profiling process generates a mathematical battery model that is uniquely tailored to your specific battery, ensuring the fuel gauge reflects its true behavior under real operating conditions.

See how to use the generic models here Using pre-profiled battery models

As long as the battery type and manufacturer remain the same, a single .inc model can be used across the entire production batch.
The nPM1300 fuel gauge tolerates typical battery‑to‑battery capacity variations of around ±10%, so minor differences across cells will not require re‑profiling.

If the battery chemistry, capacity, voltage range changes significantly in a future batch, then a new profile is recommended.

2. Yes. The profiling workflow in the nPM PowerUP desktop app requires both:

nPM1300-EK
nPM Fuel Gauge Board (nPM‑FG)

The FG board is essential because it provides the controlled discharge and measurement path needed for generating a valid battery model.

3. Unfortunately, you can't replace nPM-FG board with PPK2.

The nPM-FG board is purpose‑built to act as a programmable current sink for the PowerUP profiling process. It generates the exact discharge patterns required to create a valid .inc model. The PPK2 cannot replicate this profiling functionality and is not supported by the PowerUP workflow.

Also if you are able to profile the battery using the nPM1300‑EK + nPM‑FG board and send us the generated .inc files and project folder, we can perform a secondary review to ensure everything looks correct. :)
Here is the link to the Fuel Gauge Application Note

Best regards,

Tharaka