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Posted by Tony on October 3, 2009, 7:09 pm
Thomas wrote:
>> How do these batteries differ from the old type lead-acid batteries
>> that required occasional addition of water? What's different about
>> these batteries?
>
> Sealed = no evaporation.
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.
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> that required occasional addition of water? What's different about
> these batteries?