Reproduction AGM Battery Question

1969383S said

If I remove a cap I see no liquid and know this is correct for AGM as it is absorbed in the fiberglass Mat. Question is with the small residue I see after charging will adding a tiny bit hurt it?

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I believe it will dilute and lower the specific gravity. I tried this several times when working for Harley as they all use AGM batteries but it never worked to sustain the battery life, and the battery was on a tender when the bike sat. It seems the AGM's last for about 7 years if your lucky but then leave you stranded. Others may have different results.