jkwilson wrote:
You may have overfilled them. Most marine/RV batteries are full 1/4” to 3/8” below the ends of the split tubes. Avoids splash out during bouncing and charging.
X2!
That is what my Dad taught me.
As long as the top of the plates are covered your batteries will be fine.
Adding water to touch or go high into the split tubes is going to cause the battery to expel more water than it should and appear to use more water than expected. That water will get into the caps vent and slowly weep all over the top of the battery.
Basically, you need "headroom" as the battery charges, it will "boil" when charging..
You need a place for any boiled vapor to recombine back into water droplets..
That happens in that empty head space..
Recombined droplets happens too far up the tube and the water vapor escapes..
The excessive water vapor escaping is what causes most of the terminal corrosion also that folks complain about..
