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Old 09-08-2015, 12:45 PM   #11
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Here is what Trojan battery company has to say about filling batteries.
Don
Oh, after you complete the charging of the battery it may show normal voltages, but you may notice that your battery no longer lasts as long when only running on battery. By discharging your battery that low, the batteries rated Ah, is probably going to be reduced some.
Don
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Old 09-08-2015, 01:51 PM   #12
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I don't think I would hook up a battery that is reading 6.7 volts to my vehicle. That battery needs to be brought back to life slowly!
Your vehicle battery will dump a LOT of amps into that battery and that could draw down your vehicle battery too much or pull too many amps out of it.

Getting a charger or plugging in your trailer are better options once you figure out why it wasn't charging in the first place.

Cheers
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Old 09-08-2015, 07:55 PM   #13
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Quote:
Originally Posted by Subaru297 View Post
I don't think I would hook up a battery that is reading 6.7 volts to my vehicle. That battery needs to be brought back to life slowly!
Your vehicle battery will dump a LOT of amps into that battery and that could draw down your vehicle battery too much or pull too many amps out of it.

Getting a charger or plugging in your trailer are better options once you figure out why it wasn't charging in the first place.

Cheers
Here is how you can do it.

Without starting your TV engine, hook the battery cables to the TT's battery (or another fully charged 12Volt battery). Monitor the TT battery voltage and remove the jumper cables when the TT batteries get to 10 VDC. If the voltage does not get up to 10 volts in about 5 minutes, disconnect the jumper cables and charge the TV battery for 10 minutes and try once more. Since the TT battery is not a "0" volts, it should bounce up to 10 VDC pretty fast. Once it gets to 10VDC pull the jumper cables and turn on your TT's charge controller. The TT charge controller will charge the battery using its internal program to time each cycle. After 2 hours I would check the battery voltage (disconnect from TT for the open circuit voltage), it should be close to 12 volts. Also check the battery case temperature with you hand to see if it is hot. If it is leave the battery disconnected and let it rest for a few hours. Recheck the voltage and start the charging process again. At night, leave the battery disconnected and in the morning check the voltage, if it is around the same voltage as the night before, the battery should be good and you can continue charging it.

If you get a smart charger, and it is a 6 or 12VDC charger (with a selector swithc) it may think your battery is a 6 volt battery based on its current voltage, and not charge it, so you may have to get the voltage up to around 10VDC before using them.

You could take it to a Autoparts store and have them put it on a charger for an hour or 2 to get the voltage up to 10 or 12 volts (then use the TT to charge it properly the rest of the way), but you have to make sure that they use a voltage that is less than 15 volts, as deep cycle batteries do not like being charged FAST.

They can also check the specific gravity of each cell to see if there are any shorted cells. Be prepared... Past experience, they will tell you that the battery is toast and you need to buy one of their top of the line batteries. If you do, do not buy one with a CCA rating, as that is not a true deep cycle battery.

In any case keep checking the water level in the battery and its temperature throughout the process...

Good luck,

Don
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2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package

Our Solar Album https://www.jaycoowners.com/album.php?albumid=329
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Old 09-09-2015, 09:03 PM   #14
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A BatteryMinder brand charger/maintainer MAY bring the battery back to life, it will take some time, but it may. I've used this brand for several yrs now, and hooked one up to the cranking battery on my GH (original OEM battery) which was weak and old, would not hold a charger very long. Now this battery is strong and will crank the V10 just fine.
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