Wasn't there something about mixing different types of batts on the same
charger? Something to do with charging rates?
"Doug Dotson" wrote in message
...
Bob,

We installed 2 8D Concord Lifeline AGM batteries about 4 years
ago. They are still going strong. That includes 8 months of full time
cruising where they were cycled twice a day and only occationally
fully charged. They absolutely will vent a little from time to time.
One of the problems with the early AGMs was that the valves were
sometime defective and resulted in damage or explosion. Haven't
heard anything lately in that regard. If you are going to use them,
make sure that the charging system is set properly for AGMs.
They are capable of quite a bit of abuse in regard to discharge
and high charge rates, but don't live very long if improperly
charged. Much of the bad rep they got when first introduced to the
marine market was due to improper charging. Also, the discharge
behavior is different than a liquid lead acid so folks would think
they were defective when in fact they were performing normally.

Hope this helps.

Doug
s/v Callista

"Bob Whitaker" wrote in message
om...
Does anybody have any direct experience with the AGM (Absorbed Glass
Mat) batteries? One manufacturer claims that these batteries are
completely sealed against fumes and don't require venting. Does
anybody have these on their boat?

Bob Whitaker
"Free Spirit"