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Jan 23rd, 2013
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Longer charge time on trolling batteries #13233407 08/02/19 04:42 PM
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Noojen Offline OP
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Iím running a 24V setup with 2 flooded cell deep cycle batteries connected to a two-bank 8 amp charger. It used to take about 4-5 hours after a lake session to fully charge the batteries...now itís taking upwards of 8-10 hours. I checked the acid levels this morning and both were full. Any ideas?

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Re: Longer charge time on trolling batteries [Re: Noojen] #13233408 08/02/19 04:43 PM
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fouzman Offline
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How old are the batteries?


"Things turn out best for those who make the best of the way things turn out" - Zachary Troy Schrah - a young man with vision far beyond his years.
Re: Longer charge time on trolling batteries [Re: fouzman] #13233415 08/02/19 04:47 PM
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Originally Posted by fouzman
How old are the batteries?


Coming up on 4 years old...I charge before and after every visit to the lake.

Re: Longer charge time on trolling batteries [Re: Noojen] #13233427 08/02/19 04:55 PM
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Probably near time to replace them. That or your charger is going bad.


"Things turn out best for those who make the best of the way things turn out" - Zachary Troy Schrah - a young man with vision far beyond his years.
Re: Longer charge time on trolling batteries [Re: Noojen] #13233447 08/02/19 05:24 PM
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Is there a way to determine if itís one or the other?

Re: Longer charge time on trolling batteries [Re: Noojen] #13233452 08/02/19 05:32 PM
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Do you notice when you're fishing that the batteries draw down quicker then before? Thats how I can tell that
I'm gonna need new batteries soon.

Re: Longer charge time on trolling batteries [Re: Noojen] #13233454 08/02/19 05:33 PM
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Re: Longer charge time on trolling batteries [Re: Noojen] #13233472 08/02/19 05:50 PM
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A lot of times when a battery goes bad it will kinda bow out on the sides. Every one Iíve had go bad has done that.

Re: Longer charge time on trolling batteries [Re: Noojen] #13234175 08/03/19 01:46 PM
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I can tell you when I had Deep Cycle Batteries in my previous boat, I would usually only get about two years out of them. Maybe it was my boat and charging system. My new boat has AGM's and I got 6 years out of the last set. Just my opinion.

Re: Longer charge time on trolling batteries [Re: Noojen] #13234176 08/03/19 01:48 PM
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EastTexasBassin Offline
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4 years is pretty damn good, time for a pair of new ones now.

Re: Longer charge time on trolling batteries [Re: Noojen] #13234179 08/03/19 01:53 PM
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4 years is pretty good for a normal lead battery. Probably time for a couple new ones. Sam's club has the Duracell 31 AGM for $159 I believe. Best bang for your buck on a trolling motor battery.

Re: Longer charge time on trolling batteries [Re: Noojen] #13234190 08/03/19 02:06 PM
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My first step would be to buy a battery tester (water tester) and test each cell to see if any are dead. If none are dead you can try and recover them with a 2.5 amp charger over a week long period or so. Otherwise do what everyone else says and replace them.

Re: Longer charge time on trolling batteries [Re: Noojen] #13234212 08/03/19 02:38 PM
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I wouldn't mix wet cell and AGM on 24 volt system. They don't charge the same.


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Re: Longer charge time on trolling batteries [Re: EastTexasBassin] #13234224 08/03/19 02:56 PM
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Originally Posted by EastTexasBassin
4 years is pretty damn good, time for a pair of new ones now.

This, 2-3 years is average for flooded, I usually got 4-5 before one went bad. If one goes bad the batteries it's connected to will often be right behind it. You can have them tested after charging to see which one is bad, but I found if I didn't replace all I was just doing the same work several times vs one and done.

Re: Longer charge time on trolling batteries [Re: Noojen] #13234335 08/03/19 05:51 PM
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If your battery charger has a recondition mode on it use it first and see if that helps. It does a desulfation of the crystals in the battery and can/will make the battery take a better charge and last longer. I do this about every 30 recharges or at least once a year if I don't go fishing as much as I want to .

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