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#11580415 - 05/03/16 10:58 AM Battery Question
obsessive Offline
Angler

Registered: 03/02/11
Posts: 408
Loc: Irving, Tx
I currently have a Humminbird 898 and have all my electronics and pumps hooked up to my starter battery. I have not had any issues with the battery cranking the motor yet but I have noticed that it doesn't seem to hold a charge as long. After a couple of hours on the water I notice the voltage going down to about 11.0v and after 5 hours the other day it went down to 10.2v. I don't ever remember it going below 12v when I was on the water and was wondering if the battery is going bad? Its between 1-2 years old. I'm getting these voltages from the display on the Humminbird unit.

I was planning on upgrading to a Helix 12 and I'm worried that its going to drain the battery much faster. I don't have room under my center console to add any more batteries to separate the starter and electronics and running wires through those BS pipes under the deck (I have a 23 center console) is just about the most frustrating thing on the planet so I don't want to relocate any batteries.

This is my battery http://www.walmart.com/ip/20531538


Edited by obsessive (05/03/16 11:09 AM)
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#11581095 - 05/03/16 05:00 PM Re: Battery Question [Re: obsessive]
Capt Craig Offline
Extreme Angler

Registered: 08/25/09
Posts: 1045
Loc: Richland-Chambers
Seems like your battery isn't recharging when running your motor. Might need to get that evaluated.
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2013 Nautic Star 2110 Shallow Bay Boat

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#11581164 - 05/03/16 05:54 PM Re: Battery Question [Re: obsessive]
Bob Landry Offline
Extreme Angler

Registered: 08/10/11
Posts: 2016
Loc: Austin, Tx
Agreed. You should measure something greater than 13V across your battery terminals with the motor running.
This would also be a good time to add a second battery to get all of that other stuff off of the starting battery. If your battery is of the "dual purpose" or marine starting battery, running it down to a deep discharge with the trolling motor is going to take it out pretty quick. The plates in those batteries just won't hold up to repeated discharges.
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2015 Seaark 1872 MV CC Etec-90
Helix 12 CHIRP SI, HB 1199, MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic

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#11581355 - 05/03/16 07:38 PM Re: Battery Question [Re: obsessive]
Flippin-Out Offline
Extreme Angler

Registered: 02/25/15
Posts: 1564
Loc: Magnolia, TX
Bob, I don't think he has the TM connected to the starting battery. He seems to be describing the standard electrical plan for a boat. I'm guessing he has a bad battery, but certainly should check for alternator voltage when the engine is running above idle. Since he has a flooded cell battery, a hydrometer would be the best way to check it. I bet he has a dead cell in that battery.

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#11581405 - 05/03/16 07:59 PM Re: Battery Question [Re: obsessive]
obsessive Offline
Angler

Registered: 03/02/11
Posts: 408
Loc: Irving, Tx
When the engine is running it is a little over 13v and when it shuts off its 12v for a couple mins and then it starts dropping. It so far has always had enough juice to start the engine but I never remember it lowing voltage so quickly. I thought one test of a battery was if it had enough amps to crank the engine it is still good. I feel like it's just losing energy storage capacity.
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#11581855 - 05/03/16 09:59 PM Re: Battery Question [Re: obsessive]
Flippin-Out Offline
Extreme Angler

Registered: 02/25/15
Posts: 1564
Loc: Magnolia, TX
You have a bad battery.

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#11581974 - 05/03/16 11:17 PM Re: Battery Question [Re: obsessive]
Capt Craig Offline
Extreme Angler

Registered: 08/25/09
Posts: 1045
Loc: Richland-Chambers
Yep, bad battery.
_________________________
Capt. Craig Copeland

2013 Nautic Star 2110 Shallow Bay Boat

Nautic Star Boats Pro Staff (nauticstarboats.com)
Redneck Fish'n Jigs Pro Staff (redneckfishn.com)

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#11581989 - 05/03/16 11:32 PM Re: Battery Question [Re: obsessive]
Bobby Milam Offline
Extreme Angler

Registered: 07/13/14
Posts: 1989
Loc: Arlington
Put a full charge on it and take it in to be tested. Sounds like it has a bad cell. You're more than likely going to be stranded on the water with it eventually

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#11582607 - 05/04/16 10:47 AM Re: Battery Question [Re: obsessive]
Bob Landry Offline
Extreme Angler

Registered: 08/10/11
Posts: 2016
Loc: Austin, Tx
Harbor Freight sells a resistive load tester for around $12. It's a good tool to have. Charge overnight, let it rest for 24 hours then load test it. it has to rest so you won't be reading a surface charge.
_________________________
2015 Seaark 1872 MV CC Etec-90
Helix 12 CHIRP SI, HB 1199, MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic

Bitter Gun Owner
Bitter Clinger
Armed Infidel

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#11582914 - 05/04/16 01:30 PM Re: Battery Question [Re: obsessive]
Flippin-Out Offline
Extreme Angler

Registered: 02/25/15
Posts: 1564
Loc: Magnolia, TX
Surface charge is a capacitive charge on the battery cells giving an elevated no-load voltage reading. Seconds after a load tester is loaded onto a battery, the surface charge is long gone. I will admit that it's still not a bad idea to let the battery rest a bit, but just to see if it has a shorting cell that will kill itself in the brief rest period. If it does that, the battery is really a dead cause. But also, if its really that bad, you're going to see it when the load tester is engaged, not matter how long you do or don't wait.

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