Two 6v batteries,12v charge

Fuddy Duddy

Well-known Member
My 6v charger has bit the dust. So far the time I'm linking two 6v
batteries and charging then with 12 volts. I've got 5 good 6v
batteries laying around and only using one of then. Question is, Is
there any problem charging a run down battery together with one
fully charged. My generator is no more than an idle pulley. Never
has worked. So I have always just recharged it at the end of the day.
That has alway worked good. Guess I'll fix it someday. But with so
many other more pressing projects I just haven't got around to it as
yet.
 
Sorry for the double post. I was on 'page two' and wounding maybe I did some wrong when it didn't show up.
 
When you charge 2 in series as you are saying, the total charging current flows through BOTH batteries & when one is already fully charged, it will experience over-charging all the time that you are trying to charge the other battery. If you keep the electrolyte level up in it, it will help it survive, but is not good for that battery. Careful with the out gassing & sparks or you could hurt yourself.
 
Guess you are right. I've got to get to a Flea market soon to find a
replacement. Them extra batteries are just going to set around till
they go bad though anyway most likely.
 
I'm no expert however I think I might take a charged battery and "jump" the discharged one +to+ , -to-. That way the charged one would charge the other untill they were evenly charged. Maybe overnight at least a couple hours. Then series them on the 12 volt charger.
joe
 
(quoted from post at 11:44:58 12/15/12) I'm no expert however I think I might take a charged battery and "jump" the discharged one +to+ , -to-. That way the charged one would charge the other untill they were evenly charged. Maybe overnight at least a couple hours. Then series them on the 12 volt charger.
joe
ounds good on the surface & "might" work out, BUT, let's just say the dead one is really very dead,,,,,,,,,,then the initial current upon connecting the 2 will be very high & if it lasts more than a few seconds, it may damage one or both batteries. I call it "iffy", but if had a variable control to adjust & monitor the current, then plausible. If I were to try it and battery to battery current was more than 5 amps after the first minute or two, I would shut the experiment down. Further, if it was more than 50 amps during the second 10 seconds, I would also stop. In other words, I am not comfortable with it. That is just my personal opinion.
 
Well with 5 -6 volt batteries you could try an series parrel (sp) thing so you are charging 4 of them at a time with a 12 volt charger. In theory it would work well and all 4 would get charged and that way in theory at least 2 of the 4 would get a full charge if one was in fact weak or bad. But again all that is theory and you know how theory can be and that is why the bumble bee can fly he does not understand the theory in physics
 
Agree with the previous posters and would add, using a small charger is always easier on a battery. Same for two in series.
 
Try placing a 12 volt headlight bulb in series with a 6v battery, say to the positive terminal. Connect the negative of the charger to the negative of the battery, the positive of the charger to the other side of the headlight bulb. The bulb will act as a resistor and you will have a 6v trickle charger using a 12v charger. May not work on a smart chargers. Do this when charging 6v batteries used on grandkids toys. By adding more bulbs in parallel with the first bulb, you will get more current. I find bulbs are a cheap power resistor. this way you can get a slow charge from a 12v charger.
 
Seems that would make the best since. I'll start doing that till I come up with a new charger. Thanks fro everyones imput.
 
i would not charge a dead and charged 6v bat in series on a 12v cahrger.

6v charger is sooooo easy to make with a wall wart.

that or a 6v lamp and a 12v charger. harger and lamp will determin max charge current available
 
Hook the 2 batteries in series with the 12v charger. Also put a load such as a headlite bulb across the good charged battery. When the weak battery comes up, take the load off the good one to finish (trickle) charge them both.
 
what a roundabout backwards way to do that.

leave the good battery out and just use the bat charger, lamp bulb abd dead battery... forget the chickens, snails ands puppy dog tails.

this ain't brain surgery....
 

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