Question 1

What problem does this tool solve?

Accepted Answer

The official APP cannot export high-resolution cranking waveforms. This tool directly reads raw Log files captured via Bluetooth, decodes the internal hex packets, and restores the 100Hz high-precision cranking voltage curve. This helps in assessing the battery's instantaneous discharge capability and the starter motor's condition.

Question 2

What do the red and orange dots on the chart represent?

Accepted Answer

The red dot (Min) represents the lowest voltage the battery drops to under the heavy load of the starter motor. The orange dot (Starter) is the turning point, calculated via an algorithm, where the starter motor's power is cut off and the engine successfully takes over generating power.

Question 3

How do I get a Log file to upload?

Accepted Answer

You can use a Bluetooth analysis tool on your phone, or the log export feature built into the official BM6 APP, to save the captured broadcast data as a .txt or .log file. Make sure the file covers the time period when the engine was started.

Question 4

Are there any privacy or data leak concerns when uploading a Log file?

Accepted Answer

None at all. This tool is developed purely with front-end (JavaScript) technology. All data parsing, hex decoding, and chart rendering are done independently within your browser. No data is uploaded to any cloud servers.

Question 5

How low does the cranking minimum voltage (Min) need to drop to indicate the battery might be failing?

Accepted Answer

For a healthy 12V lead-acid or AGM battery, the minimum voltage during engine start at room temperature usually stays above 9.6V. If your red dot consistently falls to 9.0V or lower, it may indicate battery aging and increased internal resistance. It is recommended to seek professional testing early.

Question 6

Why does it say 'No valid cranking waveform found' after uploading the file?

Accepted Answer

This usually happens because the Log file didn't capture the complete packets at the exact moment of starting. Check if there's a successful 'cranking.add:ok' mark in the file. Additionally, if the phone is too far from the car during startup, Bluetooth packet loss will result in incomplete waveforms that cannot be parsed.

Question 7

How does the algorithm determine the orange dot (starter motor disengagement point)?

Accepted Answer

This tool uses a 'dynamic threshold' algorithm. The program first automatically detects the 'initial resting voltage' before starting. When the voltage rebounds close to this initial voltage (indicating the motor is disconnected or the alternator takes over), it traces backward to find the last local minimum during the valley rebound process. This makes the tool perfectly compatible with both traditional lead-acid batteries and LiFePO4 batteries, which have a higher resting voltage.

BM6/BM200 100Hz Cranking Log Parsing Tool

BM6 Cranking Waveform Analysis Tool

BM6 Cranking Waveform Analysis Tool

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