Is my BMV-712 indicating a bad cell in one of my batteries?

[pwfarnell]

There is a sticky post at the top of he DIY Category with lots of FAQs in, perhaps you missed this. One of the topics has a title that describes your problem.

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Battery monitor jumping to 100% or reporting a high SOC with low Volts / the BMS shuts down

This topic covers the reported SOC being out of sync with the actual battery voltage or state. It covers BMV battery monitors, SmartShunts, Lynx BMSs and Lynx Shunts and will just be called shunt below. It is also assumed that the shunt is monitoring the domestic / house / cabin battery bank and not engine start / bow thruster / winch / caravan mover battery banks. The problems may be one or more of the following and is often linked to mobile applications with small solar systems. The SOC jum…