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8 volt batteries

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F40man

02-28-2006 20:52:32

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Im looking for some info on 8 volt batteries. How do you charge them, set the charger on 6 volt? Are they any better than a 6 volt battery? Any info would be greatly appreciated. Thanks Lester

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K-Mo

03-01-2006 06:09:01

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Re: 8 volt batteries in reply to F40man, 02-28-2006 20:52:32

I have to agree with "OLD". A 6 volt system properly equipped and the proper weight oil will work just fine. I have several 6 volt tractors and they all start in all weather. Even the Super M with live hydraulics and power steering starts in cold weather.
For a 6 volt system shop for a battery with the highest CCA, use 1 gauge cables and make sure the starter and charging sysem operate properly.
To fully charge an 8 volt connect a digital volt meter to the battery while charging, at 10 volts it will be fully charged. More than 10 volts will overcharge. If your system can't provide a full charge, the battery will sulfate and shorten the life of the battery.
My 2 cents, but to each their own. 8 volt batteries are available at most farm stores.

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F40man

03-01-2006 09:46:42

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Re: 8 volt batteries in reply to K-Mo, 03-01-2006 06:09:01

Thanks for the info.The tractor isnt mine, its one i work on now and then.

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George Andreasen

03-01-2006 05:14:33

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Re: 8 volt batteries in reply to F40man, 02-28-2006 20:52:32

Bill makes a good point. Most wall wart chargers make a dandy trickle charger, but leaving it on the battery really does no harm. They don't put out enough current to heat up the cells, but check your water level on a regular basis. I forgot to answer one question: a standard battery charger set on 6 volts will recharge an 8 volt battery just fine. Don't believe it? Hook an accurate voltmeter to the charger clips no battery) and read it...you'll find your "6 volt" setting it putting out about 9-10 volts. Again, it HAS to in order to make a current flow into the battery, so it will recharge the 8 volt nicely.

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Dan hill

03-05-2006 04:19:21

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Re: 8 volt batteries in reply to George Andreasen, 03-01-2006 05:14:33

Dont bet on a 6v charger charging an 8 volt battery.If the charger has selenium rectifiers that are weak the voltage output drops off.Open circuit voltage readings are meaningless.A flash lite cell that reads 1.25 volt on a meter can drop to zero when a bulb is added to the circuit.Bulb life is greatly reduced when voltage runs higher than rated voltage. 5 inch 6v sealed beams can cost 14.00 each.Better not use lights if you are fooling with an 8v battery.Your generator is at risk as you are making it put out increased wattage.10 amps at 7v equals 70 watts.10 amps at 10v equals 100 watts.

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F40 man

03-01-2006 09:49:07

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Re: 8 volt batteries in reply to George Andreasen, 03-01-2006 05:14:33

Thanks for the info, im just learning about 8 volt batteries.

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Bill in IN

03-01-2006 04:40:39

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Re: 8 volt batteries in reply to F40man, 02-28-2006 20:52:32

Works for me. An easy charger can be made from a wall wart of around 300mA set to ~9 volt. Makes a fair trickle charger that I put on the battery when the temp dives below 10 and take off when its above that- basically it may be more of a heater than charger in that instance.

Some generators have a third brush adjustment and you should try for around 10 volts output to do it right.

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George Andreasen

03-01-2006 04:18:11

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Re: 8 volt batteries in reply to F40man, 02-28-2006 20:52:32

I had to jump in on this one....

I've installed 8 volt batteries in several pieces of equipment over the years, including model A Fords. They can be ordered at any battery outlet and the cost is comparable to a 6 volt. They will crank faster than the 6 volt and the generator WILL recharge them usually without any adjustments. Why? Because a 6 volt generator puts out about just over 8 volts. It HAS to in order to charge. Normally any light bulbs do NOT have to be changed. If anything, they're a little brighter.
These 8 volt cells were designed specifically to improve the cranking characteristics of 6 volt systems without massive changes to the existing equipment and they've been around for years. Changing to 12 volts for real world use is a good idea, but if you want to leave your "antique" system in place the 8 volt battery would be the way to go.
I wouldn't be afraid to make the change. Have someone that knows how to use a voltmeter (multimeter) check the output voltage of your generator. Adjust to the battery manufacturer's recommendation if necessary (usually not). George

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jim johnson

02-28-2006 21:30:51

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Re: 8 volt batteries in reply to F40man, 02-28-2006 20:52:32

Oh and yes you charge them on 6 volt

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jim johnson

02-28-2006 21:29:22

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Re: 8 volt batteries in reply to F40man, 02-28-2006 20:52:32

They were made to help turn it over better with more power but not burn out the lights like a 12 volt system will

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old

02-28-2006 21:09:28

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Re: 8 volt batteries in reply to F40man, 02-28-2006 20:52:32

8 volt battery is a bandadie fix for a poor 6 volt system at best. Either fix things the way they should be of up grade to a 12 volt system.

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Mark - IN.

03-01-2006 19:57:37

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Re: 8 volt batteries in reply to old, 02-28-2006 21:09:28

You know, this is about the 3rd or 4th post I"ve seen with regards to 8 volt batteries. I"ve never seen or run across an 8 volt battery, and it makes me wonder if the intent of an 8 volt battery was or would be to be used in series of 3 for a 24 volt system, or used in something that is actually a true 8 volt system. Nothing comes to mind on the latter though.

I"ll be the second to admit that I"m stupid at times, and the first to admit that I"m stupid would be everyone else.

Old, what"s your knowledge of these things? I"ve honestly never seen one.

Mark

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old

03-01-2006 20:38:21

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Re: 8 volt batteries in reply to Mark - IN., 03-01-2006 19:57:37

Well in all my years I have never seen or heard of any tractor/machine haveing an 8 volt battery stock. So I guess it was just a way to get more to the starter and a way to trick a weak spark system into working. Or as I say a bandade fix at best

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Mark - IN.

03-01-2006 21:40:20

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Re: 8 volt batteries in reply to old, 03-01-2006 20:38:21

Yep, nothing sure comes to mind except maybe some other configuration of a 24 volt. Hmm. Oh well, thanks Old.

Mark

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F40 man

03-01-2006 09:54:12

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Re: 8 volt batteries in reply to old, 02-28-2006 21:09:28

Old thanks for the input but its not my tractor so i dont have any say over it. He dosent use it much and it sets for long periods without running. He may let me have a go at it this spring. Have to wait and see. Thanks again Lester

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F40man

03-01-2006 09:58:14

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Re: 8 volt batteries in reply to old, 02-28-2006 21:09:28

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