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Old 08-27-2012, 05:57 PM
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Default Battery advice - I have searched already

Hello

I have a Yamaha f115 currently rigged with 2 group 24 deep cycle batts

They are so dead can't turn motor over. Batts are 4 years old

I don't use a trickle charger. Can't.

Can deep cycle batteries be brought back from low charge?
Should I just buy new ones given their age and screw trying to charge them?
If so should I switch to deka dual purpose?
I dont troll or have a stereo so I figure going to dual purpose can only help my starting as in group 24 they have more cca
Anything anyone see that I am missing?

I don't mind buying new batts but if deep cycle are best knowing my batts can die and I just need to charge them then I will buy a better charger

I wish I could use boat more often but family commitments make that tough right now

Thanks
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Old 08-27-2012, 05:59 PM
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i don't think its great for battery life to get run all the way down. if i were you i'd just replace them.
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Old 08-27-2012, 06:10 PM
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I use dual purpose batteries, and don't think you need deepcycles. They work for me.

You could get yourself some kind of solar panel to keep them up, too. I have one, about a foot square, designed for outside use. It does a great job.
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Old 08-27-2012, 06:29 PM
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If they are run flat and sit for more than a day or so, they will not come back to a full charge.
You're in a boat, so a boost with jumper cables, while not impossible, will be a lot harder to find than one on land.
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Old 08-27-2012, 06:56 PM
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Default Baitdragger,

if you can't use a charger where your boat is the best battery for you is an AGM battery. AGM stands for absorbed glass mat. AGM batteries hold their charge much longer than a wet cell battery does without being recharged. However, that being said, I do not use AGM batteries because I'm frugal, or cheap. I, like you do not use my boat, as often, as I would like, so I remove my batteries and take them home for maintenance charging in parallel on a 12 volt charger. From what you have posted, you have no need for deep cycle batteries, and really don't need two batteries, especially if you are not going to maintain them. What good are two batteries when they are both dead? You would be much better off with one good battery that you maintain properly.
BTW, if you want to learn much more about marine batteries just google marine batteries and read until your heart is content.
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Last edited by Bayfly; 08-27-2012 at 06:57 PM. Reason: Add sentence.
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Old 08-27-2012, 07:04 PM
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The Deka dual purpose batteries work well. If you can't find them nearby, West Marine branded batteries are made by East Penn, who also makes the Dekas.
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Old 08-27-2012, 07:11 PM
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I had considered AGM but some searches seem to show they don't play nice with Yamaha 4-stroke alternators. I am going to email Yamaha tomorrow

It is hard to meet the minimum specs for reserve capacity in the yam manual without a deep cycle battery

Thanks for replies
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Old 08-27-2012, 07:15 PM
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I work 1 block away from a deka store. But they aren't much help. And the outside sales guy never returns calls. My last boat had 3 deka starting batteries. Worked great so I just bought exact duplicates from them when I replaced but I had good part number in my hand and needed no customer service so it worked out. This boat came with off brand NOrth state deep cycle. Today they kept asking if I wanted to warranty claim and then what was my deka part #. Felt like banging my head into their sales counter
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Old 08-27-2012, 07:18 PM
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Quote:
Originally Posted by baitdragger View Post
I had considered AGM but some searches seem to show they don't play nice with Yamaha 4-stroke alternators. I am going to email Yamaha tomorrow

It is hard to meet the minimum specs for reserve capacity in the yam manual without a deep cycle battery

Thanks for replies
total crap from yam - they work fine...reserve cap means nothing to a motor...
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Old 08-27-2012, 07:33 PM
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Are you running a bunch of electronics? If you're mostly just using the batteries to start the boat, then you really don't need deep cycle.

Deep cycle, like the name implies, are designed to withstand "deep" discharge/charge cycles. They were invented/deveolped for use with trolling motors which will regularly drain batteries down to nothing. Conventional batteries will most likely be damaged by doing this - hence the need for deep cycle.

The problem with deep cycle is that you pay a price for the deep cycle ability - a compromise, like so many other things in life. The compromise is that deep cylce batteries do not do very well at producing large amounts of current on demand (in a short time which is exactly what is required to start a motor). But they do do well producing modest amounts of current over a long period of time which makes them great for trolling motors and electronics.

Starting batteries on the other hand, do great at producing high amounts of current over a short time, but they can easily be damaged by continuously drawing them down to very low levels. Being able to produce high amounts of current like that makes them great for starting motors which is a short endurance, high demand application.

All the above is basically a simplified explantion of battery design/use. The following is a combination of opinion and experience.

Dual purpose batteries are yet a further compromise and IMO don't do either job all that well. I've tried using them to start my Optis and every size and brand I've tried just plain SUCKED at starting those notorisously hard to spin motors. I tried conventional dual purpose, Blue Top and AGMs. When I finally found someone who still offered a true, marine STARTING battery I was absolutely amazed at how well they start the Optis. As you might gather, marine starting batteries are hard to find these days. I've been getting mine at Cabela's.

Note: Your F150s are surely not near as "starting current hungry" as my Optis and will probably start just fine with today's dual purpose batteries, but even those motors would probably benefit from running pure starting batteries.
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Old 08-27-2012, 07:38 PM
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If you have a "smart" battery charger, you can try to de-sulfate the batteries.
I have salvaged a couple of batteries using this feature.
I takes 24 hours and you may have to do it a couple of times to revive a battery.
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