"bob prohaska" wrote in message news:t6s686$jqu$1...@dont-email.me...
Removing the caps and checking all levels and specific gravities is more
certain. Be careful.
"A Google search shows that you are correct in first only filling to just
above plates (if low), then charging it. Various sources say after charging,
then fill to 1/4 inch below the vent well, 1/8 inch below, or just barely
touching the bottom of the vent well, depending on who you want to believe."
The only easily visible level indication is when the level touches the
bottom of the well and shows curved edges (meniscus) in the flashlight's
reflection. I think filling to that level when the maker suggests 1/4" below
it reduces the specific gravity a hydrometer reads, but doesn't change the
amount of acid. I've called East Penn's tech support line and received
further instructions, you could call Clarios about yours.
The level increases during charge and decreases during discharge, as the
acid moves to/from the water into the plates. Top up the level with
distilled water only after fully charging the battery.