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9 volt battery put in a 1948 Brockway tractor

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Robert V. Coons

04-11-2007 08:37:43




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I bought a 9 volt battery at the "Tractor Store" because the 6 volt batteries died every year.

Now the battery is low and I'm confused how to charge the 9 volt battery...On the 6 or 12 volt setting?

Can anyone provide guidance?




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David, Surrey UK

08-22-2007 06:27:39




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 Re: 9 volt battery put in a 1948 Brockway tractor in reply to JMS/MN, 04-11-2007 08:37:43  
You can charge a lower voltage battery with a 12V charger, provided:

1. The charger has some kind of current limiter in it. Modern chargers do, older ones just use the transformer resistance to limit the current and will overheat and be damaged. In that case you'll need an external resistor.

2. You don't allow the battery voltage to rise above 2.5 volts per cell. A lead-acid battery is rated at nominally 2 volts per cell, so a 12V battery has 6 cells and presumably an 8V battery has 4. (I've never seen an 8V battery.) So that means you mustn't exceed 10.0V. If you do there will be excessive gassing and overheating. Actually 2.5 volts per cell is a bit on the high side and if the battery's in a good condition it should be about 2.4 volts per cell when fully charged.

David

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Dairy Farmer in WI

08-21-2007 19:22:49




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 Re: 9 volt battery put in a 1948 Brockway tractor in reply to glennster, 04-11-2007 08:37:43  
i charge my 8 volt battery on 6 volt slow for like 2 days and it charges fine. 12 volt MIGHT boil out the battery. then you have a junk battery.

just charge on 6 volt.



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Brad51

08-13-2007 17:52:17




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 Re: 9 volt battery put in a 1948 Brockway tractor in reply to Robert V. Coons, 04-11-2007 08:37:43  
I emailed Interstate Battery two days ago with the same scenario. They suggest that a 12 volt regulator be substituted for the 6 volt regulator and that it could be derated to 9.2 volts. The engineer went on to say that the regulator and generator combination should be calibrated on a bench test machine and not connected to the battery when setting. I think the battery would act as a resistor unless it had been properly charged to a full 8 volt. Hope this helps. Does anyone know if such a volatage regulator is aval. for a positive ground system??

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george md

04-14-2007 23:20:20




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 Re: 9 volt battery put in a 1948 Brockway tractor in reply to Robert V. Coons, 04-11-2007 08:37:43  
Robert, I have a 56 Diamond T that has a series- parallel set up to start on 12 v and charge 6 volts . I uses the same circuitry as the 12/24 volt systems on the later big trucks, but with 6 ans 12 volt components. When I bought the truck it had a battery from Lancaster Battery in it , that battery was basically two 6 volt batteries built in a common case with the 2 center cell ties brought up thru the case so that you could mount the series - parellel switch between the two cell connections . It worked well and requires no major changes to the vehicles electrical system. The same switch used to be available from J C Whitney catalog , I have not looked in one of their catalogs for many years .

george

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JayWalt

04-12-2007 18:07:50




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 Re: 9 volt battery put in a 1948 Brockway tractor in reply to Robert V. Coons, 04-11-2007 08:37:43  
that is the problem with these 8 volts batteryies. Ideally they should be float charged at 9.2v. You will not readily find a charger to charge the battery properly. Open circuit voltage on a 6v "startering" booster should be sufficient to charg the 8 volt battery. Best to use a volt meter and see where you are at and what u can get with the chargrs you have. Be very careful, as you can easily overcharge the battery.

You could very easily built a 3 amp charger/float charger. Just need a transfomrer, full wave bridge rectifier, filter cap, and an LM350 regulator, a few resistors to set the voltage and a heatsink. I built one for 12v batteries when they are stored, real nice.

If I had some LM350s left, I'd build ya one relatively cheap. It wouldnt charge a dead battery (well it would, but it would take about a day), But would be perfect for hooking up when u park it so its always charged.

Why did u get the 8 volt battery? A properly functioning 6 volt system should start it fine. Maybe convert it to 12v? just need a spare alternator, and a 12v coil and some lights, not too difficult. (not sure about the starter/solenoid on 12v tho).

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old

04-11-2007 09:49:30




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 Re: 9 volt battery put in a 1948 Brockway tractor in reply to Robert V. Coons, 04-11-2007 08:37:43  
Do you by chance mean 8 volt??? I've never heard of a 9 volt one. Any how thats one of the problems with the 8 volt batterys they don't make a charger for them and it you use the 6 volt setting you under charge it and if you use the 12 volt setting you over charge it, so you can win for looseing either way



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Robert V. Coons

04-11-2007 12:56:36




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 Re: 9 volt battery put in a 1948 Brockway tractor in reply to old, 04-11-2007 09:49:30  
Yes.... You're correct it's a 8 volt. Should it be charged at the 12 volt setting. Would the new chargers prevent "overcharging".



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old

04-11-2007 13:21:09




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 Re: 9 volt battery put in a 1948 Brockway tractor in reply to Robert V. Coons, 04-11-2007 12:56:36  
If you do use a 12 volt charger I would only use a 2 amp setting if you have one like that. Other wise I would set it at 6 volts and cross your fingers



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