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Old 07-01-2018, 06:59   #46
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Join Date: Nov 2008
Location: Toronto, Ontario or Bahamas
Boat: Benford 38 Fantail Cruiser
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Re: Bulging battery-is it ruined?

Originally Posted by a64pilot View Post
Of course they do, any thing does doesnít it?
However an AGM battery is a VRSLAB, that is valve regulated sealed lead acid battery, there is a valve, an AGM will vent gasses, but must build up enough pressure for the valve to open before it does, so a slightly bulging AGM means nothing, nor does a slightly caved in looking AGM. Short an AGM and it will hiss at you, just like any battery will as it vents gases, just under normal conditions, they donít vent, they recombine gases back into water.
Read here on Lifelineís manual where it says what causes bulging or caved in looking end walls.
Attachment 161756
it's not the only case I've seen of swollen and burst AGM's regardless of what the manufacturers marketing department says.

That hysterical laughter you hear as you sail a way in your "new" boat ..... is the seller.
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