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Farmall & IHC Tractors Discussion Forum
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charging 6 volt battery

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Nebraska Cowman

11-07-2003 04:52:59




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my 6 v charger died. The question is can I use my 12 v charger by using a resistor in the line to the battery. I was thinking the same resistor we use on the coil when we switch from 6 to 12 v.




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Ken

11-07-2003 13:55:59




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 Re: charging 6 volt battery in reply to Nebraska Cowman, 11-07-2003 04:52:59  
I solved that problem by buying a combination 6 and 12 volt charger at Walmart.



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Nebraska Cowman

11-07-2003 10:12:01




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 Re: charging 6 volt battery in reply to Nebraska Cowman, 11-07-2003 04:52:59  
thanks guys, I'll try the light bulb trick



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Jake

11-07-2003 06:52:15




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 Re: charging 6 volt battery in reply to Nebraska Cowman, 11-07-2003 04:52:59  
To make it simple, NO !! A resistor will not work. A resistor drops a varying amount of voltage depending on how much current is running through it. You will have to get a new 6 volt charger. Now if you want to stand there and watch your battery charging rate and voltage and then change the resistor as required to change the charge rate and voltage as your battery state-of-charge changes well, then, maybe.....

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RayP(MI)

11-07-2003 14:33:58




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 Re: Re: charging 6 volt battery in reply to Jake, 11-07-2003 06:52:15  
Jake is right - but, as battery gets up to fully charged, the current through the resistor drops, and the voltage applied to the battery gets very close to the maximum charging voltage at the 12 volt setting: Somewhere approximately 15 volts. This will cause your battery to heat, and boil off the electrolyte, and cause damage to the battery plates. Use a 6 volt charger for 6volt battery!



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Steve - IN

11-07-2003 05:30:26




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 Re: charging 6 volt battery in reply to Nebraska Cowman, 11-07-2003 04:52:59  
Nebraska Cowman,

First problem I see is the resistor you use for the coil may not be able to handle the current the battery wants.

Take a look at the power rating on the side of the resistor. It'll probably be somewhere from 25 to 40 Watts. If your 12V charger does 6 amps, that's 72 watts! - and gets worse if it's putting out 8, 10 or 12 amps. That resistor is going to get real hot, and eventually fail.

If you have one of the chargers with a low setting, ~2amp switch, you could do it without killing the resistor.

I've been charging my 6V with a variable power supply - 6.5V @ 2 amps for about a day - seems to work well, as it's about a 50aH battery.

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Gary_N_WV

11-07-2003 06:15:23




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 Re: Re: charging 6 volt battery in reply to Steve - IN, 11-07-2003 05:30:26  
In a pinch, I have wired a 6 volt bulb (brake or parking light type, not a headlight) in series with the battery and then applied the 12 volts.
The bulb provides a voltage drop of about 1/2 of the 12 volts and also limits the current.
Of course, I suppose most people don't have a 6 volt bulb laying around.



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Bob M

11-07-2003 06:41:04




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 Re: Re: Re: charging 6 volt battery in reply to Gary_N_WV, 11-07-2003 06:15:23  
A 12 volt headlamp, brake light or backup light bulb in series with a 12 volt charger and 6 volt battery works fine. It limits the charging current to about 4 amps max - even if the battery is completely flat.



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