I don't know about your specific batteries, but typically there is a
tube going downward from the vent hole. I think this is what you mean
by the vent hole extending below the top of the battery. You want the
water level to just touch the bottom of this tube. Fill them when
they are fully charged.
Ken
_______________________________________________
Elec-trak mailing list
Elec-trak cosmos phy tufts eduhttps://cosmos.phy.tufts.edu/mailman/listinfo.cgi/elec-trak