Originally Posted by Subaru297
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.
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...
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