Deep cycle battery question


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Old 06-07-21, 05:35 PM
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Deep cycle battery question

Ok, tell me what I think I already know... lol.

Iíve got a group 31 deep cycle battery that has 2 seasons on it, dated 7/18... itís had a rough life. When it was 1year old, after its first season, the float charger failed. When spring came along the battery was at 1.5 volts. I was able to get it to recharge but it seemed as it lost a little capacity but still plenty good enough. The very next year, through a connector mishap, it was hooked up backwards on a 6 amp charger for just a moment, there was a brief moment of panic. I then let the battery sit all winter without a recharge. This year it read 12.6v before charging it. I put a 10 amp charger on it and it charged at 8 amps for a few hours. I felt the sides of the battery and it was pretty hot down the side of the neg terminal. I let the battery rest a day and charged some more, it got down to 6 amps and was pretty warm again. After another day of rest, itís now down to 4 amps on charge. Also keep in mind I was charging the battery outside on an 89 degree day, I wasnít sure what would happen so I wanted it outside.

Do you think itís heading towards being usable or do you think itís toast?
 
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Old 06-07-21, 06:10 PM
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Batteries don't like the freezing cold with no charge.
After a few hours the charge rate should have been very low.
The capacity of the battery has been compromised and won't return.
 
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Old 06-07-21, 06:24 PM
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The battery was in my garage all winter that would never see below 55 degrees, usually warmer.

update.... after 1.5 hours on charge tonight, the battery reads full charge. I plan to take it to where I purchased it and get it load tested to see what it will do.
 
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Old Yesterday, 12:49 PM
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Update #2

Iíve been charging it off and on, the lowest Iíve seen the charger go is 2amps. Granted, I could let it cook longer and I may.

I took it to Batteries + Bulbs today where I bought. They used what looked like an inexpensive automotive code reader on itÖ 12.6v and they say itís 589 cca on a battery rated for 500 cca. If thatís true, itís as good as it was when it was new, not sure Iím buying it. I guess the test will be when I actually beat on it with the trolling motor out on the water.
 
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Old Yesterday, 01:07 PM
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Battery testers are not necessarily that accurate. It also depends on how they're used.

Testing it out trolling is the best way to test.
 
 

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