AGM batteries are about as bullet proof as you can get. They were actually
invented by the Concord Battery Company for the US Navy for the F18 fighter
program. There are a couple other companies building them now (most
batteries are made by only a few companies, just marketed under different
names). I think East Penn is probably the biggest manufacturer (though I am
not absolutely sure) - West Marine batteries used to be made by East Penn,
don't know for sure today.
Anyway, the AGM battery has been tested in all kinds of situations by the
Navy and private researchers. They have been totally submerged in sea water
and they still work and there is no damage. (They won't short out totally
submerged in sea water and will still power your equipment!!!).They can't
get water into them since they are sealed, so there is no damage to the
battery. One of the boats the shop I was Ops Manager for was installing a
huge bank and we ended up mounting some of the batteries on their sides
(because of lack of vertical space) and they just did their thing, no
problems. They will even work upside down, try that with a flooded battery.
But they do cost at least half again more, maybe a little more than that.
But I think they are the only battery to have on a boat.
AGMs tend to have a longer duty cycle than either flooded or Gel batteries,
(Most certainly Gels -- by far). Now the golf cart batteries (mostly likely
Trojan brand) someone mentioned might give them a good run for their money,
but AGMs are so maintenance free that they are worth the extra money. The
secret to long battery life (as I mentioned) is to not let them discharge
too deeply. That is why it is better to have a large reserve of Amp Hours so
you can run off the batteries and not kill them. I like to charge mine when
they still have 75% of their charge remaining.
Regular flooded batteries should be "boiled" every once in awhile. The
problem is that the plates get a build up of sulfate (sulfation) and they
start to lose efficiency. So what folks do is to take off the caps and run a
high voltage charge (over 16 volts) through them. The electrolyte literally
seems to boil. After whatever time is needed, the electrolyte is topped off
and the caps put on. This is the particularly dangerous time since a lot of
hydrogen is produced -good ventilation is a must. I am not recommending you
do this without researching the process as it is a little dangerous!!!! But
a high percentage of batteries scrapped probably could still be used bydoing
this.
By the way, there is also a device called Hydrocaps for flooded batteries.
They replace the battery cap and have a catalyst in them. Flooded batteries
"gas" meaning they give off Hydrogen and Oxygen. The Hydrocap catalyst
recombines the two gasses to make water and drop it back into the cell, thus
eliminating the need for adding water (it is like an automatic watering
system). Be sure you get the Hydrocap specifically made for your battery
since not all battery caps are the same.
From:
AlbinVega@yahoogroups.com [mailto:
AlbinVega@yahoogroups.com] On Behalf
Of vegatern
Sent: Sunday, November 25, 2007 7:06 PM
To:
AlbinVega@yahoogroups.com
Subject: [AlbinVega] Re: Battery location??
I know that the flooded lead plate batteries that I have create
gassing problem, and I guess they are ruined, if they get covered by
water. What happens to a AGM battery when it is covered by water?
Can they be saved and recharged?
Craig