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Old 11-14-2017, 11:13 AM   #1
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Are my batteries shot?

2.5 year old NAPA 6 volt batteries. Never low on water and never depleted below 60%. They were dead when I went to MH yesterday.
12 volt system was shut off. Should not have been any draw beyond the Propane alarm, etc. I have the batteries out and on a bench charger. Are they shot? Or will they recover when fully charged back up?
Right or wrong, I've often left my house batteries connected and in the MH over the winter and have never had a problem. Other years I've put them on a trickle charger which was what I was about to do when I got there yesterday.
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Old 11-14-2017, 11:18 AM   #2
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"Are they shot? Or will they recover when fully charged back up?"

Time will tell, if shot the specific gravity will not recover.
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Old 11-14-2017, 11:30 AM   #3
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Charger showed the batteries were at 2.5 volts when charging started at 2amps rate. Less that 1hr and charger shows batteries are at 11.5 volts.
Is this a normal pattern?
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Old 11-14-2017, 11:30 AM   #4
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Take 'em to NAPA or other auto parts store, they will test for free.
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Old 11-14-2017, 11:43 AM   #5
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Charge them and check with hydrometer should hold 1.275 specific gravity

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Old 11-14-2017, 12:13 PM   #6
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Quote:
Originally Posted by ej1144 View Post
Charge them and check with hydrometer should hold 1.275 specific gravity

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I'll do that...thanks for all the replies..
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Old 11-14-2017, 05:17 PM   #7
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Lucas,

Yes, that pattern is typical. Try to not exceed 10 ampere charge rate for an long time - like 30 hours. By no means let them get warmer than the room. Right now, hot will kill them quickly.

We used to see this a lot in our boat business (before the depression) and usually, if they were killed gently and are brought back up the same way, they will give good service for a few more seasons. They will show signs of having been hurt, but they will probably be good enough for a while more. In sailboats that killed the house bank over the winter, the bank was usually still good for a couple more years. Sailboats are tougher on the house bank, and my general guess was that this shortened the useful life by about a season.

So, keep the low level charge going for a couple of days and then test.

If you don't have a good hydrometer, don't buy one. Unless it has a thermometer included for correction, they are more trouble than they are worth. Instead, look up a cheap Chinese refractometer. These don't care about bubbles or temperature.

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Old 11-14-2017, 06:45 PM   #8
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Thanks Frank. Great info..the batteries have been on the charger at 2amp rate for 7 hrs and have been showing 12.1 volts for at least 4 hrs. Charger has yet to indicate FULL charge.
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Old 11-14-2017, 07:02 PM   #9
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Think of it this way.

Lets say your batteries are 100 AH capacity. Your using a 2 amp charger. Thats will replace 2 amp per hour, or 2 AHs. It will take, at least, 50 hours to recharge a totally dead 100 AH battery.
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Old 11-14-2017, 08:38 PM   #10
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The draw of propane and co monitors can kill a battery bank pretty quickly. My trailer has a 10 amp solar panel and I live in the desert but no way will it keep up with the draw from the detectors. I always turn my disconnect switch off whenever we are not connected to shore power or the truck. Even at that the solar charger just barely replaces what the battery loses with nothing connected at all.
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