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How To Charge An 8-Volt Battery?

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rjm

05-03-2000 10:12:25

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I bought an 1948 8N which has a 8-volt battery. How should it be charged? Can you use a 12-volt charger on trickle or should you use a 6-volt charger. Thanks.....

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Gary

05-03-2000 18:07:48

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Re: How To Charge An 8-Volt Battery? in reply to rjm, 05-03-2000 10:12:25

I have used a Wal-Mart 6/12 volt charger on my 8v battery successfully by setting it to 6volts with the high or 6amp setting. With this setup the amps will taper off as the battery charges until it gets to about 2amps. I always get a full charge with no battery damage even when leaving the carger on up to 24 hours.

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jamesc.

05-03-2000 13:13:45

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Re: How To Charge An 8-Volt Battery? in reply to rjm, 05-03-2000 10:12:25

Some ways of charging an 8 volt battery. This is just theory, never had an 8 volt battery. Also will need some knowledge of electronics.

You will need about 9 volts at the terminals to charge the battery. Remember that a 12 volt battery is 12.6 volts and the alternator puts out 13.8 volts.

1. A 12volt charger with a 12 volt lamp in series with the positive terminal. Try an 1156 lamp.

3. A 9 volt AC-DC adaptor. Will take some time if the adaptor does not burn out. At least it will make a good trickle charger. Radio shack has these.

2. (Warning-DEEP) Use a 12v charger with a resistor in series with the positive cable. The resistor will drop the voltage. The value of the resistor is a problem since each charger is different and the current to the battery changes as the battery charges. It will take some math and experimentation. I would start with 10 ohms and high wattage. Then check the battery terminal voltage.

4. Build your own charger with a 9 volt trasnformer and a rectifier diode. Radio shack carries an 18volt center tap transformer (2 9volt wingings)

5. Find an adjustable power supply and set if for 9 volts.

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Mike S

05-03-2000 11:01:04

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Re: How To Charge An 8-Volt Battery? in reply to rjm, 05-03-2000 10:12:25

While it would be nice to find an 8 volt charger somewhere, you can use a 12 volt charger set at the 2 amp setting. But you have to watch it closely. You need to move quickly if it starts to bubble or get hot. I would check it every 20-30 minutes depending on how low the battery was when you started. A good 6 volt charger will put out about 7.5 volts, so that might be close enough to get it up enough to get the tractor cranked, then let the generator finish the rest of it. Most voltage regulators can be adjusted to put out 8+ volts.

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Vern Mitchell

05-03-2000 10:46:18

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Re: How To Charge An 8-Volt Battery? in reply to rjm, 05-03-2000 10:12:25

I to had a 8 v.battery and the same problem you describe. I was able to charge my battery with a 6 v. manual charger. The automatic chargers won't work because of the voltage difference. I would recommend that you go back to a 6 v. battery and not fight it though. If your wiring is clean, well connected and of the propper size you will be able to start your rig without much problem. My main problem was the jury-rigged mess some fellow had made of the wiring. I replaced the whole harness and the battery cables and she starts right up. Good luck!!

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