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Author Topic:   Battery Recommendations
Feejer posted 12-17-2007 08:26 PM ET (US)   Profile for Feejer   Send Email to Feejer  
I'll be changing the battery in the spring and I'm just looking for ideas for what is the best battery I can put in the boat. I run a single Group-24 on my Montauk with GPS, SONAR, and a VHF radio. I don't think I'll be installing any type of radio.


Chuck Tribolet posted 12-17-2007 08:46 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
What motor? Some motors (Optimax??) require a lot more
cranking amps than most.

If your motor requires only "normal" cranking amps, I'd
recommend a dual-purpose battery. It has close to the
cranking amps of a starting battery, and is somewhere between
a starting battery and a deep-cycle battery in its tolerance
to being run down.

What brand? Lead-acid batteries aren't exactly rocket
science. It's a cost/performance trade-off, nobody has a
technology edge. I use West Marine brand. Dir-Hard and
Optimax should be good too. Some other folks will chime in
with other brands. Just don't let cost be much of a factor.

Some folks may tell you that you need an AGM (absorbed glass
mat) battery. I don't think so. I run a flooded battery,
and the boat goes out on the Pacific Ocean about 70 days a year.
I've never spilled any acid. (and I'm on the end of the
longest fetch in the world). AGM batteries are for fighter


glen e posted 12-17-2007 09:02 PM ET (US)     Profile for glen e  Send Email to glen e     
I disagree - flooded batts are last gen....I would not have them anywhere near my boat...When I got my current boat the flooded batts came out within a week and AGM's went in...Yellowfin, Seavee and Intepid are using AGM's... I guess their stupid?...nope - read here about why AGM's are the way to go...hell, just for the simple reason they don't discharge much less in storage and don't need water are good enuf for me...

Read here:

jimh posted 12-17-2007 11:41 PM ET (US)     Profile for jimh  Send Email to jimh     
There are many factors to consider in a battery, most of them electrical or mechanical, however I would like to introduce another consideration: where the battery is manufactured.

Because a valve-regulated lead-acid absorbent glass mat (VRLA AGM) battery can be easily shipped, the manufacturing of these batteries has moved offshore, and of the AGM batteries on the market now, a very high percentage of them are made in China. I recently bought over $10,000 of AGM batteries for replacement use in a large UPS. All were made in China. The supplier told me that almost all the AGM batteries available to him were made in China.

However, for every rule there is an exception. The DEKA battery company in Pennsylvania makes AGM batteries in the U.S. See:

If you can buy the battery at a retailer so you don't have to have it shipped, you can choose from a wider variety of batteries. If you must have the battery shipped to you, you probably will have to buy an AGM.

jimh posted 12-17-2007 11:48 PM ET (US)     Profile for jimh  Send Email to jimh     
I have found this DEKA literature to have good information for making a choice of the type of battery to use in a marine application:

Jordi posted 12-18-2007 08:59 AM ET (US)     Profile for Jordi    
Anyone using Gel batteries on their Verados?..thoughts...
Feejer posted 12-18-2007 09:11 AM ET (US)     Profile for Feejer  Send Email to Feejer     
Thanks guys, 2005 Merc 4 stroke 90hp
jimh posted 12-18-2007 09:30 AM ET (US)     Profile for jimh  Send Email to jimh     
The type of charging current and voltage available from your outboard motor is another consideration in deciding on what battery to use. Lead-acid batteries with a gelled electrolyte ("Gell batteries') usually require specific voltage limits when being re-charged. AGM batteries are also sensitive to charging voltage. The "old-fashioned" flooded-cell lead-acid battery is probably the least fussy about charging voltage and current.

Over-charging a battery tends to lead to loss of electrolyte and a reduction in battery life.

Jefecinco posted 12-18-2007 10:09 AM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     

I've enjoyed fantastic reliability and long life with Optimas. I have a two battery set up but I see no reason that it should impact reliability. My only reason for two batteries is that I know a battery can fail completely with absolutely no warning. Having a back up battery gives me a warm fuzzy.


Feejer posted 12-18-2007 10:30 AM ET (US)     Profile for Feejer  Send Email to Feejer     
Thanks Butch.

Currently I just have a one battery setup with an On/Off switch and a standard flooded battery that has served the boat fine for 3 full seasons.

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