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Posts: 208
Location: Sun Prairie, WI | checked my water levels and found this on one of my batteries. There are two wired in parallel. (12 volts) I know the batteries are old and probly need replacement but they have always held a charge and taken a charge. What causes this? |
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Posts: 208
Location: Sun Prairie, WI | Ok gonna try the pics again
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 20130626_193620 (2).jpg (119KB - 184 downloads)
20130626_193800 (2).jpg (163KB - 194 downloads)
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Posts: 139
| over charging? i would just replace them if you can. |
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Posts: 994
Location: Minnesota: where it's tough to be a sportsfan! | I would be happy you had them in battery boxes!! I would also look to the charger not shutting off when charged. Or rate of charge being too high causing the battery to boil. Check your charger also. Then ask yourself how do you charge? Do you go out for 4-5 hours and come in and put on charger? One of my rigs uses two deep cycles in par wiring. You can get 2-3 days on a charge depending on the weight of the boat. If it is a question put a volt meter in line so you can see battery charge levels. Cheap gauge. |
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Posts: 208
Location: Sun Prairie, WI | I have a charger in the boat that has 2 banks. I will keep them plugged in all the time. Fish for 3 hours or 10 they get plugged in everytime I get home. So the first thing to check would be how much voltage is being applied to each battery during the charge? I want to get new batteries but don't want a bad charger to ruin them. |
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Posts: 139
| as mentioned, i would look into the charger. as i said above, seems like an overcharge situation. |
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Posts: 208
Location: Sun Prairie, WI | Well I pulled the leads off the battery and the one wing nut was eaten up pretty bad. Could a loose connection do this? I did plug the charger in and put a volt gauge on battery. Both banks were showing the same output. Next time I run the boat I will check the voltage of the charger when its charging and when it says its done to see if it really is stopping the charge process when its supposed to. |
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Posts: 227
Location: Maple Grove | Lose the wing nuts and use nylon lock nuts on your new batteries. |
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Posts: 2754
Location: Mauston, Wisconsin | WI_guy_turnedMudDuck - 6/27/2013 9:22 PM
Lose the wing nuts and use nylon lock nuts on your new batteries.
Nylon nuts will not give you enough contact pressure. Always use stainless steel hardware on your batteries- nuts & washers.
JJ- This is actually a battery post seal problem. As a lead-acid battery ages, the positive plate grids grow. This pushes against the positive post and causes the seal between the post and the case to begin to separate. When there is sufficient separation, the electrolyte then is drawn out of the battery through the opening by capillary action and it reacts with the battery terminal and corrosion is formed. If the positive plate growth has advanced this far, the battery is near end of life...replace it.
Oh, almost forgot. Positive plate grid growth is accelerated by constant float charging. Sometimes called trickle charging......
Have fun!
Al
Edited by ESOX Maniac 6/29/2013 7:40 AM
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Posts: 410
Location: With my son on the water | That is right on the money Al and good tips.
Thanks |
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Posts: 208
Location: Sun Prairie, WI | so am I better off charging the batteries then unplugging the charger? I thought it was best to keep them up. Also if my charge indicator on the trolling motor says full charge when I get home should I even plug them in? I always thought it was best for a battery to stay fully charged?
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Location: Eastern Ontario | A deep cycle battery only has so many recharge cycles. Back in my working days we had a number of battery operated lift trucks with huge deep cycle batteries (some weighing up to 2000 pounds) we were told they shouldn't be recharged until they were down to 10% however we were able to pull up to a roller rack that contained fully charged batteries. I live 5 min from where I fish so often go out for an hour or two after supper and may go out 4 or 5 times before recharging. If I'm going somewhere for a full day or two I start with a fully charged battery.
Starting batteries are a different animal and are designed for a short high discharge and then a recharge controlled by a voltage regulator. |
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Posts: 227
Location: Maple Grove | ESOX Maniac - 6/29/2013 7:35 AM
WI_guy_turnedMudDuck - 6/27/2013 9:22 PM
Lose the wing nuts and use nylon lock nuts on your new batteries.
Nylon nuts will not give you enough contact pressure. Always use stainless steel hardware on your batteries- nuts & washers.
Agree on the stainless. |
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Posts: 208
Location: Sun Prairie, WI | So that's what ill do with the new batteries when I get them. Charge them when they are low or when I know im gonna be on the water for a long day. Typically Im on the lake for 4-5 hours at a time and the battery gauge still says either full or 75% |
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Posts: 2754
Location: Mauston, Wisconsin | Recharge every time you come off the water. Never leave them sit in a discharge condition. Also, don't leave them on charge for week's or month's at a time.
Batteries have two different life limits, you can't usually exceed ether one.
Service life: This is usually 3 yrs, 5 yrs, 10 yrs or 20 years. Even if you never discharge it, it age's just like we do, and will usually fail at end-of-life (EOL).
Cycle life; This is usually 100-300 deep discharges, and depends on the individual battery. A deep discharge is usually considered to be to ~10.5V. If you discharge to ~10.5V daily, I wouldn't expect the battery to last more than 100 cycles (100 days).
Of course everything is relevant, you get what you pay for with batteries too......
Have fun!
Al
Edited by ESOX Maniac 7/3/2013 1:02 PM
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