Battery electrolyte/distilled water normally does NOT evaporate. Ideal charge rate for automotive world 12v systems IS 13.8-14.2v. Motorcycle charging systems, for whatever reasoning is a bit higher than the ideal maximum charging voltage, which can and does cause minor evaporation of water/electrolyte.
Your battery being THAT low on distilled water/electrolyte leads a suspicion to the large plug-in behind the fuse panel. Regulators have no way of knowing there's a voltage drop due to poor connections from alternator to regulator to battery. Result is a higher charge rate than necessary in relationship to voltage being used by system from battery.....resulting in an overcharge rate, which results in electrolyte evaporation
.
BTW, was trained specificly in all aspects of 12v charging systems some 40yrs. ago........but slept since then
.
FWIW, I normally get 7-12yrs. of use from an Interstate battery WITHOUT a re-charge. That amount of time use IS considering rest of systems electrical charging circuit IS operating correctly!
Your battery being THAT low on distilled water/electrolyte leads a suspicion to the large plug-in behind the fuse panel. Regulators have no way of knowing there's a voltage drop due to poor connections from alternator to regulator to battery. Result is a higher charge rate than necessary in relationship to voltage being used by system from battery.....resulting in an overcharge rate, which results in electrolyte evaporation

BTW, was trained specificly in all aspects of 12v charging systems some 40yrs. ago........but slept since then

FWIW, I normally get 7-12yrs. of use from an Interstate battery WITHOUT a re-charge. That amount of time use IS considering rest of systems electrical charging circuit IS operating correctly!
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