12 V battery sensor: more than one voltage

Useful to know

The Bosch electronic battery sensor is designed for 12 V lead-acid batteries. It measures voltage, current, and temperature, and an algorithm uses the information to assess the condition, including with aging accounting. [1]

Therefore, a value from a momentary voltage measurement is not equivalent to the entire assessment of the system. Two batteries may require different judgment according to their operating conditions and history. This is about the low-voltage battery, not the entire control system of a high-voltage traction battery.

In case of replacement or problem, follow the procedure for the specific vehicle. Externally, a similar battery does not automatically mean the same type, parameters, and energy management requirements. The most important thing when reading a diagnostic screen is to distinguish the measured quantities from the calculated status indicators.