My experience has been if you don't recharge deep cycle batteries soon
after depletion, say less than 24 hours, a few times of this and your
battery's capacity is reduced. You can get some 29-MAXX's at Wal-Mart
for $65 each. These have a little more life than 27's which go for about
$55 each at Wal-Mart. Both are worth what they cost.
Peter
http://cgi6.ebay.com/ebaymotors/ws/e...sort=3&rows=50

Messing In Boats wrote:

I've got a two year old house bank of two Group 27B's. (the 27B's are
supposed to be a little bit better than a plain Group 27) Last summer
they seemed to loose their ability to keep my refrigerator and anchor
light working as long as they used to and I'm wondering if they are shot
or not. They have gotten a lot of use these last two years, so I won't
whine too much if they are gone, but I would hate to replace them if
they aren't.

How do I check this out?

Is there some way to de-sulpher the plates or something to re-energize
them and save me a $130 trip to Sam's Club?

Capt. Jeff