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Spookz
LSU Fan
Baton Rouge
Member since Oct 2016
91 posts

Minn Kota Ulterra - Losing Battery Quickly
The last 3 times I have taken my boat out fishing I have noticed that after 4-6 hours of fishing- my trolling motor battery loses juice very fast. I am a fanatic about charging it after every use and making sure both batteries are charged and ready to go. This used to never be a problem, but it seems to be getting worse.

A few reference points:

- I use spot lock, A LOT, but I always have and am just now experiencing this problem this year

- the trolling motor and batteries were purchased new 2 years ago (2 - 12V deep cycle batteries)

- Minn Kota Riptide Ulterra (80 lb thrust)

- I broke my original prop one of the first time's launching (because I am an idiot) and replaced it with a used one a buddy had laying around at his camp (it is made for the same trolling motor as it fits perfect)


Has anyone else experienced this? Any ideas on how to address this?


CypressTrout10
Southeastern LA Fan
Louisiana
Member since Jun 2016
2529 posts
 Online 

re: Minn Kota Ulterra - Losing Battery Quickly
If you are using an on board charger, it could be bad.


Mister Bigfish
LSU Fan
Member since Oct 2018
371 posts

re: Minn Kota Ulterra - Losing Battery Quickly
Get the batteries tested. It’s the easiest and most likely problem.

Wet cell batteries can go bad quickly and easily even if charged properly. Anything over 3 years of life with a wet cell battery I consider bonus time.

And like the poster above said it could also be the charger. Have it tested to make sure it’s outgoing current is correct when powered up.
This post was edited on 5/3 at 12:09 pm


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civiltiger07
LSU Fan
Baton Rouge
Member since Dec 2011
11853 posts
 Online 

re: Minn Kota Ulterra - Losing Battery Quickly
as already stated your batteries are bad.


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redfish99
LSU Fan
B.R.
Member since Aug 2007
11683 posts

re: Minn Kota Ulterra - Losing Battery Quickly
Spot lock motors and 24 volts of power not ideal, you getting all you gonna get 4/6 hrs is tops. 36 volt systems far superior all day performance.


choupic
LSU Fan
Somewhere on da bayou
Member since Nov 2009
1898 posts
 Online 

re: Minn Kota Ulterra - Losing Battery Quickly
Make sure the batteries have water(Distilled). Remove top caps to check level.


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Redlos
LSU Fan
Baton Rouge
Member since Jul 2005
806 posts

re: Minn Kota Ulterra - Losing Battery Quickly
Battery make/model?


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Spookz
LSU Fan
Baton Rouge
Member since Oct 2016
91 posts

re: Minn Kota Ulterra - Losing Battery Quickly
I never actually considered that. Will check in to that along with all the other recommendations. Much appreciated - to all.


DownshiftAndFloorIt
US Space Force Fan
Here
Member since Jan 2011
58158 posts

re: Minn Kota Ulterra - Losing Battery Quickly
I used to fish all weekend on a 24v ipilot. They are great on batteries. Op has bad batteries


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mtcheral
LSU Fan
BR
Member since Oct 2008
1579 posts

re: Minn Kota Ulterra - Losing Battery Quickly
Mine was doing the same on relatively new batteries. Changed them out and all good.


KemoSabe65
Member since Mar 2018
4271 posts
 Online 

re: Minn Kota Ulterra - Losing Battery Quickly
Bad battery will also cause the breaker to pop when run on high (10). I have had multiple bad Delco Voyager group 27's annually. Moving to group 27's from walmarks.


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dawg23
Mississippi St. Fan
Baton Rouge, La
Member since Jul 2011
4603 posts

re: Minn Kota Ulterra - Losing Battery Quickly
Are you disconnecting power to the trolling motor after each trip ?

My old Minn Kota (24v, 80 lb. no spot lock) would draw power any time the unit was plugged into the power receptacle on the bow. Even when the unit itself was turned off.

I called Minn Kota and was told that this is common on that series of trolling motor. I was advised to unplug the trolling motor after each trip, and plug it back in the next time I launched.

FWIW my batteries were wired directly to a large round socket style outlet on the bow. The trolling motor had a matching male plug.


Redlos
LSU Fan
Baton Rouge
Member since Jul 2005
806 posts

re: Minn Kota Ulterra - Losing Battery Quickly
You can buy a load tester from Harbor Freight and test yourself. I agree that it sounds like you batteries may be bad.

Highly suggest the AGM Duracell’s from Sam’s Club.


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Spookz
LSU Fan
Baton Rouge
Member since Oct 2016
91 posts

re: Minn Kota Ulterra - Losing Battery Quickly
This is interesting. I would guess just powering it down via the power button would accomplish the same thing as unplugging... will try this if the batteries check out. Thanks!


Follow up question... after a little research on deep cycle marine batteries; does anyone prefer wet cell to AGM? I currently have AGM.

In my limited knowledge I always viewed AGM as better than wet cell and below lithium.

One other note is I am wondering if it is possible I am overcharging the battery? I typically leave them plugged in/charging the night before I take off for a weekend fishing. I always assumed the 2 bank charger would regulate this once a full charge is read/done. I read something about this in my search and had never heard of such a thing.


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