Originally posted by karrak
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I wasn't thinking about keeping the voltage the same but more about actively shifting charge from cells that have reached the absorb voltage early and during absorb actively pushing extra charge into the cells which are staying at a lower voltage rather than letting the voltage rise in some cells to the point where they outgas. That is why I specified active balancing.
However, again, you can't say "oh, that cell is at 2.35V so it's fully charged, any more charging and it will outgas." You can measure with a hydrometer (most accurate) or you can charge until you know it's at 100%. So traditional voltage balancing won't be as effective as it is for (say) lithium ion.
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