>
> Part of charging these batteries actually includes getting the electrolyte
> to bubble to stir the acid since the acid will settle and stratify at the
> bottom.

This is true, but it's also impossible to completely charge a lead-acid
(including AGM)   battery without gassing.  Trojan's charging regimen for
flooded cell batteries included a planned wastage of the water in the
electrolyte, needing to be supplemented regularly.

Yrs,
d