Battery Bank Balancing for AGM, Flooded, and Lithium Cruisers

Battery bank balancing gets talked about constantly and applied inconsistently. The chemistry matters, but the discipline matters more.

For flooded batteries, specific gravity is still a truth-teller. For AGM banks, resting voltage and good logging matter. For lithium, the battery management system and a trustworthy shunt tell the real story.

The practical mistake most cruisers make is treating a parallel bank as if every string is contributing equally. One weak string can quietly drag the whole system down while the monitor still looks confident.

If the bank keeps drifting, isolate, log, and compare. You do not need a theory first. You need evidence.