Two things not mentioned is when you over fill, the acid coming out causes corrosion on your terminals and tied down supports. It can eat threw the steel supports and corroded terminals reduce or stop amp flow. My 2 6v GC batteries are not on a slide, difficult to see the water level and I tended to over fill mine. The other issue is all that acid and stuff can accumulate over time, become slightly conductive and add to the self discharge of the batteries. When my old Shumacher charger died I bought the B&D 40 amp charger and really like how it charges and maintains the batteries (Equalizing and desulfating function). I ruined my first set of Trojans after 4 years by not understanding some basic things. my 2 6V CG Sams Club batteries now in their 13 year and still working fine with better maintenance.
