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Author Topic:   Best Battery: AGM
davej14 posted 04-26-2004 10:34 AM ET (US)   Profile for davej14   Send Email to davej14  
My wet cell lead acid marine battery needs to be replaced. In doing some research it seems like an AGM-type battery would be a superior replacement because it would not outgas within the center console and it has superior charge loss characteristics during winter storage. Manufacturers warn that charging rates need to be closely regulated for these type batteries. Does anyone have experience using an AGM-type battery like the Xxide Orbital or "Optima Blue Top" with an outboard? I have a 75 ELPTO 2-stroke Mercury on my Whaler. Before spending three-times more than a wet cell type, I would like to be sure it is the right thing to do.
knothead posted 04-26-2004 11:29 AM ET (US)     Profile for knothead  Send Email to knothead     


I've had an Optima Yellowtop mounted in my console for 5 years and have experienced no problems. I use the boat maybe once every 4-6 weeks November thru March and every weekend May thru October. I've never removed the battery from under the console and have never had a charger hooked to it. It has not yet failed me.
It seemed like a lot of money when I bought it, but in retrospect, it was a good purchase. My Montauk is kept in the water during the summer with a bilge pump hooked up and the battery has always worked perfectly.
In short, if you are moving your battery under the console, I would highly recomend one or two of these.


Moe posted 04-26-2004 11:30 AM ET (US)     Profile for Moe  Send Email to Moe     
I believe an AGM battery is definitely the way to go, especially on a single-battery boat. They are more rugged and resistant to shock and vibration. They have a lower internal resistance which provides more starting current and charges faster. AGMs can be used with standard flooded cell chargers, but will charge even faster with a charger that has a profile specific to them. They have a MUCH lower self-discharge rate and can go months without charging. They don't spill acid if tipped over, and they don't outgas hydrogen and corrosive mist when charging. You can use Yellow Tops, but the Blue Tops are the marine versions with alternate posts for house circuit hook-up.


jimh posted 04-26-2004 09:25 PM ET (US)     Profile for jimh  Send Email to jimh     
[This article has been edited to correct non-standard capitalization.]
rtk posted 04-27-2004 01:38 PM ET (US)     Profile for rtk  Send Email to rtk     
I purchased two group 27 MK AGM batteries last year from this place. They were used to power a trolling motor. The batteries have performed very well and delivery was prompt. Some good battery info on this site.I am also using AGM batteries on my boat for main power instead of the lead acid.


Chuck Tribolet posted 04-27-2004 05:43 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
I think they are overkill.


WT posted 04-27-2004 07:01 PM ET (US)     Profile for WT  Send Email to WT     
You can't be too thin, too rich or have too much battery power.

I have 3 AGM's in my Montauk.

davej14 posted 04-28-2004 06:18 AM ET (US)     Profile for davej14  Send Email to davej14     
Thanks for all the comments. I purchased an Optima Blue Top starting battery. Hated to part with the $130. but the previous owner was using flooded cell batteries and there is some corrosion on the electrical contacts within the console as a result. In the long run I think it will be a good value and i won't have to fuss with charging during winter storage.

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