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 Post subject: Battery Advice
PostPosted: Wed Feb 14, 2018 6:25 pm 
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Joined: Tue Dec 05, 2017 12:12 am
Posts: 21
I have the onboard charger on my boat to chrg the 2 trolling motor batteries. I don't get out as often as I used to, so I leave it plugged in 24-7. I don't think this harms the batteries. However, what is your opinion on doing this or putting a battery tender on them after they charge up?


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 Post subject: Re: Battery Advice
PostPosted: Wed Feb 14, 2018 7:18 pm 
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Joined: Sun Feb 11, 2018 10:52 am
Posts: 6
I have a Minn Kota maitainer on my boat and never had a problem. I always plug it in when the boat is put up. I do know mine turns off when batteries are charged, then if the drop it kicks back on. I love mine and always run it.


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 Post subject: Re: Battery Advice
PostPosted: Wed Feb 14, 2018 9:31 pm 
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Joined: Thu Jun 03, 2010 5:31 pm
Posts: 45
Location: Clear Lake City, Texas
I think it depends on the type of charger you have. I have a "Pro Charging Systems" Model SS3 (Three bank). The manufacturer's instructions are "Leave your system plugged in". Per their information, the charger will charge my three batteries up and then go in a "float stage". During the "float stage" current will flow to the batteries for 5 minutes and then shut off completely for 60 minutes -- then repeat the cycle. i check the water in my batteries every month or so. Don't leave your charger plugged in unless the manufacturer says you can -- otherwise you will fry your batteries. Good luck.


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 Post subject: Re: Battery Advice
PostPosted: Wed Feb 14, 2018 11:43 pm 
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Joined: Tue Dec 05, 2017 12:12 am
Posts: 21
I think I may have one faulty battery. I unplugged the onboard charger and connected a regular one. ONe battery went up to 100% quickly. The other one was down to 10% and only went up to 78%. This is ok to use, but it shouldn't be that low when it has been on the charger all the time.


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 Post subject: Re: Battery Advice
PostPosted: Thu Feb 15, 2018 9:43 am 
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Joined: Sun Oct 19, 2008 11:33 pm
Posts: 9222
you may have a bad bank on the charger


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 Post subject: Re: Battery Advice
PostPosted: Thu Feb 15, 2018 11:35 am 
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Joined: Tue Nov 28, 2017 12:28 pm
Posts: 78
You can test the leads on the charger, they should show a constant 13 or so.

I have a MK 3 bank and keep them plugged in all the time. It shows charging, full charge, or check connection. Blinking is charging, solid green is full charge. I still test them individually from time to time though.

I thought I had a weak starting one, and took it in and it checked ok all around. Turned out a new starter was needed, worn I guess.


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 Post subject: Re: Battery Advice
PostPosted: Thu Feb 15, 2018 11:31 pm 
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Joined: Tue Dec 05, 2017 12:12 am
Posts: 21
Thanks. Sounds like very usefull info.


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 Post subject: Re: Battery Advice
PostPosted: Sat Feb 17, 2018 12:21 am 
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Joined: Tue Dec 05, 2017 12:12 am
Posts: 21
How do you go about checking the seperate banks?


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 Post subject: Re: Battery Advice
PostPosted: Sat Feb 17, 2018 3:47 am 
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Joined: Tue Nov 28, 2017 12:28 pm
Posts: 78
by the individual leads that come off the charger, I have a 3 bank and each has 2 sets of wires.


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 Post subject: Re: Battery Advice
PostPosted: Sat Feb 17, 2018 11:46 am 
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Joined: Sun Oct 19, 2008 11:33 pm
Posts: 9222
swap the leads from the charged battery to the other one to see if it comes up
the leads have to be hooked up to check them . check with a 12 volt dc volt meter or multi meter.
also the leads have a fuse inline that could be bad. or take the low battery to autozone have a
load test put on it, or take a regular car charger to it to see if it takes a charge then.
they should put out 14 volts . on charger if working. till it kicks back.


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 Post subject: Re: Battery Advice
PostPosted: Sat Feb 17, 2018 4:29 pm 
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Joined: Tue Dec 05, 2017 12:12 am
Posts: 21
Thanks for the info. Problem solved. I replaced the back one last year, thought it was maintenance free. Not the case. It was bone dry. Filled it up and recharged with seperate charger. Left over night and it was down to 40%. Got new battery today. :) You may have noticed from my posts, I am not the sharpest knife it the drawer when it comes to mech's.


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