Originally Posted by
onehundred80
I think that you should look in to AGM battery design, they have vents and they use acid not water. We agree that fumes can cause corrosion if they escape near a terminal even if the acid is held by the mat quite securely.
I have three wet cell 12 volt batteries and none have or have had terminal
corrosion.
I agree that the AGM batteries are more secure against leaks, but they can leak fumes as that is the byproduct of the charging cycle for one.
Both gel and AGM batteries de-gas like flooded batteries, but since they are sealed, the gasses are reabsorbed into the electrolyte, keeping them functional longer. Both types of batteries can release their charge faster than flooded batteries, which is an important function. In order to provide a larger level of cranking amperage, a flooded battery must be much larger, as a typical flooded battery is limited in how much charge it can release at one time. Gel and AGM batteries can release more charge at once. This means that gel cell and AGM batteries can fit in a smaller case while providing more amperage.
From napa.
Keyword "sealed"
AGM or Absorbed Glass Mat batteries are the most efficient of the lead-acid design. AGM batteries use a fiberglass separator to keep the electrolyte between the lead plates. This makes AGM style batteries extremely stable in any position, even upside down.
Can't use a battery with vents upside down.