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Grid charging exacerbates voltage depression while improving cell balance. Voltage depression is the phenomenon that results in lost capacity.
In other words, the act of grid charging necessitates periodic discharging to ensure capacity is not lost.
In most cases the vast majority of benefit of discharging is obtained when discharging to 0.8V/cell or about 96V for an Insight/HCH1. Deep discharges can readily push a pack with a marginal cell into failure.
In the vast majority of cases, if dramatic improvements aren't had by 2X discharges to 96V, there are no dramatic improvements to be had. Only after 2X deep discharges to 96V haven't paid off should an ultra-deep discharge to the depths near 0.1V cell be attempted - mostly as a Hail Mary before you replace a dead pack.
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