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Old 09-08-2015, 09:16 AM   #1
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Killed my battery

I didn't realize that the various monitoring systems in the RV would kill the battery over the course of a week and my battery is now reading only 6.5V...so, pretty much dead.

Is it worth getting a battery charger and trying to revive it or should I just go buy a new battery? If a battery charger will work, any recommendations? The Schumacher chargers on Amazon get varying reviews for charging deep cycle batteries.
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Old 09-08-2015, 09:21 AM   #2
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I would suggest that you get a battery charger and charge the battery Having one in your tool collection is always a good item to have. I have two a 10 amp unit and a 2 amp unit. Also get into the habit of disconnecting the battery power when the camper isn't being used and then you won't have the problem of a dead battery unless the battery is bad. If the battery is new as the TT is I would at least get it charged.
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Old 09-08-2015, 09:38 AM   #3
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I also use a battery disconnect. This is the only way to kill all draw on the battery.

Then check amazon or something to find a trickle charger/battery maintainer. Something to hook up to when not being used for an extended time.
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Old 09-08-2015, 09:41 AM   #4
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Thanks, folks.

I added a battery disconnect switch yesterday. Would've done it earlier if I would've known that the various monitoring systems drew so much power.
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Old 09-08-2015, 10:37 AM   #5
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Another question. If I plug in to shore power, will the onboard charger bring the battery back to life? I'm trying to avoid spending the money right now.
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Old 09-08-2015, 11:01 AM   #6
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It should What you need to do after you connect to shore power is to check the voltage at the battery you should then show 12 + Volts which would show it is charging Don't just go by the monitor panel Test at the battery
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Old 09-08-2015, 11:17 AM   #7
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Originally Posted by tylersdad View Post
I didn't realize that the various monitoring systems in the RV would kill the battery over the course of a week and my battery is now reading only 6.5V...so, pretty much dead.

Is it worth getting a battery charger and trying to revive it or should I just go buy a new battery? If a battery charger will work, any recommendations? The Schumacher chargers on Amazon get varying reviews for charging deep cycle batteries.
It may or it may not be able to charge your battery. That is the best answer I can give.

Most controllers have a low voltage point in the charge controller that when reached will automatically stop trying to charge the battery.

You can use your TV to put an initial charge into the TT's battery with jumper cables, to a raise the batteries voltage, and then plug into shore power or your home outlet.

Make sure that all your battery connections are clean and tight, check your negative ground connection on the frame and check the water level of the battery, to make sure it is filled.

When ever possible use the TT's charge controller for your TT's batteries, as that is what they are designed for. Deep cycle batteries unlike Automotive batteries do not like a FAST charge.

After you get a charge in the battery, use your newly installed disconnect switch to isolate the battery from the TT. Take a battery voltage reading and then let the battery sit for 4 hours. After the 4 hours, take another voltage reading. It should be close to the voltage reading that you initially took.

If the both the battery voltage readings are close, there is a good chance that it may hold a charge. If there is a big difference between the voltage readings, replace your battery.

A battery being charged should be around 14 volts (BULK) and will drop to 13.2 volts (FLOAT) when it is fully charged. A fully charged 12Volt batery is 12.6Volts. You never want to discharge your battery lower than 12VDC.

Don
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Old 09-08-2015, 11:33 AM   #8
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Originally Posted by Mustang65 View Post
It may or it may not be able to charge your battery. That is the best answer I can give.

Most controllers have a low voltage point in the charge controller that when reached will automatically stop trying to charge the battery.

You can use your TV to put an initial charge into the TT's battery with jumper cables, to a raise the batteries voltage, and then plug into shore power or your home outlet.

Make sure that all your battery connections are clean and tight, check your negative ground connection on the frame and check the water level of the battery, to make sure it is filled.

When ever possible use the TT's charge controller for your TT's batteries, as that is what they are designed for. Deep cycle batteries unlike Automotive batteries do not like a FAST charge.

After you get a charge in the battery, use your newly installed disconnect switch to isolate the battery from the TT. Take a battery voltage reading and then let the battery sit for 4 hours. After the 4 hours, take another voltage reading. It should be close to the voltage reading that you initially took.

If the both the battery voltage readings are close, there is a good chance that it may hold a charge. If there is a big difference between the voltage readings, replace your battery.

A battery being charged should be around 14 volts (BULK) and will drop to 13.2 volts (FLOAT) when it is fully charged. A fully charged 12Volt batery is 12.6Volts. You never want to discharge your battery lower than 12VDC.

Don
Thanks for the very detailed advice.

The battery currently sits at 6.7V. If I try to charge it with jumper cables and my TV, what voltage should I charge to?
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Old 09-08-2015, 12:26 PM   #9
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One more thing to check before and post charge, is the water level of each cell. ONLY use distilled water. I expect when you try to bring the battery up, you will boil the battery, and loose a bit of water, hence the post charge water level check. I do not recall how full is correct, but I like to have the water level to the bottom of the plastic ring. The slot will allow any gasses to escape.
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Old 09-08-2015, 12:32 PM   #10
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Man, I need one of those battery cut-off switches! BIGTIME! My vehicle has been charging it but it's still a dead battery in my opinion.
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