I just bought a new battery for my JD lawn mower. It is one of those
no-maintenance batteries that don't have any fill holes to add water.
That got me to thinking:
How do these batteries differ from the old type lead-acid batteries
that required occasional addition of water? What's different about
I don't know the actual difference but it certainly isn't an old style
that is sealed. An older style battery produces hydrogen and maybe
oxygen gas when charged. If it was sealed it would explode from the
pressure of the gases. Most car type maintenance free batteries do have
vents and emit explosive gases while charging. They are not sealed
tight. Most can also be checked and filled if low, they just make the
caps look like they don't come off but most do. Check it every couple
years instead of every couple months.
Gel cells are a whole different story.
Wasn't that a movie "Free Water", no that was Willie. Carry
I hope the OP's sealed garden tractor battery gives many
years of service. Bring the battery indoors for the winter.
Not on cement floor. Yeah, I know, that was the old rubber
cased batteries. Why take a chance.
Don't know what type of battery you actually have. The "maintenance
free" car batteries have calcium added to the lead which greatly
diminishes gassing which is the major reason you needed to add water. If
it is a gelled electrolyte then there is no evaporation.
It's been a lot of years since I read this. But there is a
different design of battery that uses lead and calcium for
the plates. It's much more resistant to over charging, and
electrolyzing the water to hydrogen and oxygen. Sometimes
mistakenly called boiling off the water. They are vented,
and can lose the water. Only problem is, no way to replace
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