Hi Bob.

 BL> No they're not sealed. The gas is hydrogen which leaks through
 BL> solid steel, and oxygen which combines with almost everything.
 BL> What happens is that they fizz, and eventually dry out. You cna
 BL> brign a gelcell back to life by drilling a tiny hole and squirting
 BL> water in with a syringe.

they stick a catylist in there that turns some (hopefully most) the fizz
back into water.

They do the same in "sealed" lead acid batteries  ISTR that the catulist
reduces the life when comaprted to a properly maintained regular lead acid
battery.


 -=> Bye <=-
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