Does my 6v have a bad internal connection?

wopachop wrote:

How can you say they are fully charged? A fully charged 12vdc battery is 12.6 and up, not 12.06.

Those threaded bolts are just stuck upside down in the lead top with a little lead around the bolt head. Like Mex said, the idea is to get your ring terminal lying on the flat lead part and use the bolt to tighten it down.

You can overdo things and pull the bolt right out of its lead bed. Oops! Now what? BTDT. You can try those adapter gizmos that clamp to the lead post that have their own threaded bolts as your new connection point.

EDIT--forgot to mention the low lead post on a 6 makes it difficult to attach the adapter clamp. You can drill holes in around the bottom and use screws down into the lead to hold it better. it works for a while, but gets loose. Just have to keep at it until it is time to get new batteries. BTDT. :(

The resting voltage on your pair of full 6s should be 12.75ish, so that is why people are saying your batts are not fully charged with the 12.4ish reading.

Full and after a rest a 12 volt deep cycle battery should show 12.7 volts...and a 6 volt 6.35.

Cool deal i will do some wiggling.

The battery is not undercharged.

Bad thread to lead connection but if the lug is laying FLAT against a clean lead connector it should make no difference. Take that connection apart after taking a smartfone image of it.

Now measure from same battery threaded post on pos to threaded post on neg. 6.3 volts? 4.2? Wiggle the threads while looking at voltage. If it even quivers you have a bad threads to lead post connection.

Don't horse the stud or you will break it and a battery warranty will be denied.

If the drama is not obvious

SAND the ring lead ring around the stud and then SAND the ring on the lug around the cable eyelet ring terminal then reassemble. This is why I despise this type of connection.

So what did you find?

I don't know about the connection, but your batteries are undercharged.