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Boat batteries question

Old 03-03-2020, 07:52 AM
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Default Boat batteries question

With hunting season over and fishing starting back up, I'm getting the boat ready..

To make a long story short, I have 2 main batteries for electronics and cranking (225 Optimax Pro XS) operated by a Perko switch. I noticed on a cold start, the motor will turn over but not start on the number 1 battery. Switch over to number 2, starts right up.. Anyway, took the boat up to Autozone to have all batteries load tested (including my trolling motor batteries.) Every battery on the boat tested good with 100% charge, EXCEPT the problematic battery I speak of.. It tested good, 12.5 volts, but only 54% charge. All batteries stay on a trickle charger 24/7 in storage.

What say ye? I'm stumped.
Old 03-03-2020, 07:55 AM
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I am not a pro, but my guess is that the battery has some "dead cells". I do know that in today's cars, if the battery is not 100%, then it could very likely cause issues. I would assume this is not different for a boat with heavy loads.
Old 03-03-2020, 07:56 AM
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Originally Posted by Manoverboard123 View Post
What say ye?
I say get a new battery - an Optimax likes to have a good battery with a good CCA rating - check what the handbooks says about battery spec before buying.
Old 03-03-2020, 07:59 AM
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How old is the problematic battery?
Old 03-03-2020, 08:04 AM
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Originally Posted by easttnboater View Post
How old is the problematic battery?
not an attack...

but sometimes the age of a battery is irrelevant.

A fews back, my brother got a whole string of brand new batteries that were bad .. they tested fine, but just wouldn't work. It wasn't until a mechanic friend of his told him try a different brand, because the manufacturer had a run of bad batteries.
Old 03-03-2020, 08:05 AM
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It's been mentioned in a couple other threads on here that the Optimax is very sensitive to low voltage and will not start if voltage drops below 11.2 while cranking.
Old 03-03-2020, 08:28 AM
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Originally Posted by HS2300 View Post
not an attack...

but sometimes the age of a battery is irrelevant.

A fews back, my brother got a whole string of brand new batteries that were bad .. they tested fine, but just wouldn't work. It wasn't until a mechanic friend of his told him try a different brand, because the manufacturer had a run of bad batteries.
I agree. I have bought quite a few new items that were bad out of the box.

The reason that I asked, is that there could be a multitude of things causing this issue. If the battery were over 5 years old, then it would percolate to the top of the issue list.
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Old 03-03-2020, 08:31 AM
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Originally Posted by easttnboater View Post
I agree. I have bought quite a few new items that were bad out of the box.

The reason that I asked, is that there could be a multitude of things causing this issue. If the battery were over 5 years old, then it would percolate to the top of the issue list.
I agree, but I would lower the age to 3+ for today's electrical products.
Old 03-03-2020, 08:39 AM
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Why trickle charge 24/7? You might be doing more harm than good. IMO it's best to charge the batteries prior to putting the boat up and give them a full charge partway through the winter, which some would consider overkill. A touch-up charge before putting them back in the boat and off you go. Too much charging causes sulfation on the plates of standard lead-acid batteries, which will limit how much and how well they hold a charge.
Old 03-03-2020, 08:51 AM
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The batteries are 3 years old.

My thought was that a trickle charger will put the batteries to a full charge, then stop charging them and just maintain their charge. I have a built in trickle charger for both the main and trollung motor batteries
Old 03-05-2020, 07:02 AM
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Well, today the battery tested bad. Gonna replace both with Interstates.. They need to be at least 800MCA for the Optimax correct?

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