Question 1

What key metrics does this system test?

Accepted Answer

The system evaluates four core metrics: 1. Storage Health (Resting Voltage), 2. Dark Current Status (Overnight Voltage Drop), 3. Charging System (Average Driving Voltage), 4. Cranking Power (Minimum Cranking Voltage).

Question 2

What is the difference in evaluation criteria between LiFePO4 and lead-acid batteries?

Accepted Answer

The system uses dual baselines. For example, a good resting voltage for a LiFePO4 battery is >13.2V, whereas for a lead-acid battery it is 12.5V. For instantaneous cranking voltage, the LiFePO4 standard is 11.5V, and lead-acid is 10.5V.

Question 3

How to determine if there is a current leak (dark current) in the vehicle?

Accepted Answer

The system calculates the 'daily voltage drop (V/day)' through long-term resting logs. If the drop is >0.3V (LiFePO4) or >0.4V (Lead-Acid), it is determined as high leakage. It's recommended to check if dashcams, aftermarket alarms, or OBD2 devices are failing to sleep properly.

Question 4

Why is 100Hz data needed to analyze cranking voltage?

Accepted Answer

Engine cranking lasts less than a second. A standard 1Hz (once per second) log easily misses the lowest voltage point. Through 100Hz high-frequency sampling, it accurately captures the voltage drop during starter motor operation to determine if cell internal resistance has increased or if the starter motor is aging.

Question 5

What is the basis for determining alternator abnormalities?

Accepted Answer

The system filters data after the engine starts. If the average driving voltage is below 13.5V (or above 15.0V), it's considered alternator aging or regulator failure. For vehicles with an Alternator Management System (AMS), the system also provides special notes for low voltages under eco modes.

Question 6

What should I do if the report shows 'Weak Storage' for a LiFePO4 battery?

Accepted Answer

If the resting voltage of a LiFePO4 battery is below 13.2V, it's recommended to take a long drive or use a dedicated charger to fully charge it. This triggers the BMS's active cell balancing function to ensure battery life and performance.

Comprehensive Vehicle Electrical System Health Check: BM6 Long-term Data Analysis

Vehicle Electrical System Health Check Report

📋 Comprehensive System Diagnostic Recommendations

Vehicle Electrical System Health Check Report

📋 Comprehensive System Diagnostic Recommendations

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