Question 1

What problem does this tool solve?

Accepted Answer

The original app does not provide high-resolution export for cranking waveforms. This tool reads raw log files captured via Bluetooth, decodes the hex packets, and restores the 100Hz high-precision voltage curve to help evaluate battery discharge capability and starter motor health.

Question 2

What do the red and orange dots represent?

Accepted Answer

The Red dot (Min) represents the moment of maximum starter load where voltage is lowest. The Orange dot (Starter) is calculated via an algorithm to show the transition point where the starter motor disengages and the engine/alternator takes over.

Question 3

How do I get a compatible log file?

Accepted Answer

You can use a Bluetooth sniffer/analysis tool on your phone or the BM6 app's internal log export feature to save broadcast data as .txt or .log. Ensure the file covers the time period of the engine start.

Question 4

Are there privacy concerns with uploading my logs?

Accepted Answer

Not at all. This tool is built with pure client-side JavaScript. All data parsing, hex decoding, and charting happen locally within your browser. No data is ever uploaded to a cloud server.

Question 5

What voltage drop indicates a failing battery?

Accepted Answer

For a healthy 12V Lead-Acid or AGM battery at room temperature, the minimum cranking voltage should stay above 9.6V. If your 'Min' point frequently drops to 9.0V or lower, it suggests battery aging or high internal resistance.

Question 6

Why does it say 'No valid cranking waveform found'?

Accepted Answer

This usually happens if the log didn't capture the specific 'cranking.add:ok' flag or if Bluetooth packets were dropped during startup. Ensure the phone is close to the vehicle during the start for a complete data capture.

Question 7

How does the algorithm determine the Starter Disengaged point?

Accepted Answer

The tool uses a 'Dynamic Threshold' algorithm. It detects the 'Initial Resting Voltage' before the start. As the voltage rebounds toward this baseline, the tool identifies the final local minimum before the alternator takes over, making it compatible with high-resting-voltage LiFePO4 batteries.

BM6/BM200 Cranking Waveform Analysis & Visualization Tool

BM6 Cranking Analysis Tool

BM6 Cranking Analysis Tool

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