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Old 11-23-2009, 03:55 PM   #1
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Default 8 Volt battery charge ???

I have a single 8 volt battery that I need to charge. Can I use a 12volt charger and monitor the charge with a voltage meter. Obviously a 6 volt will not work......
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Old 11-23-2009, 05:07 PM   #2
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Default Re: 8 Volt battery charge ???

I wouldn't let it go more than 30 minutes at a time. 30 on, 30 off, till it gets to 8.49v and holds it.

Also, no more than a 10 amp setting on the 12v charger, preferably 5 amp.
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Old 11-24-2009, 11:04 AM   #3
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Default Re: 8 Volt battery charge ???

Quote:
Originally Posted by gornoman View Post
I wouldn't let it go more than 30 minutes at a time. 30 on, 30 off, till it gets to 8.49v and holds it.

Also, no more than a 10 amp setting on the 12v charger, preferably 5 amp.


by holding it , he means wait 30 minutes after charger is off to check Voltage.
This gets rid of surface charge.
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Old 11-24-2009, 01:18 PM   #4
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Default Re: 8 Volt battery charge ???

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Originally Posted by gmorrison View Post


by holding it , he means wait 30 minutes after charger is off to check Voltage.
This gets rid of surface charge.
Thanx, G. That's exactly where I was going.
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Old 11-24-2009, 03:06 PM   #5
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Default Re: 8 Volt battery charge ???

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Also, no more than a 10 amp setting on the 12v charger, preferably 5 amp.
Assuming the battery is a 200 to 225 AH capacity no reason to limit the charge current to less than 20 - to 22 amps (C/10) You just do not want to go above the C/8 rate.

You can use the 12 volt charger on a 8 volt battery. The charger will go into constant current limit mode. You want to remove the charge when you reach 9.8 volts for 100 % capacity (2.45 vpc).
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Old 11-24-2009, 04:36 PM   #6
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Default Re: 8 Volt battery charge ???

I prefer to stay on THIS side of the safety line. Overvolting a lead acid battery at high current is a recipe for explosion. I stand by my recommendation.
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Old 11-24-2009, 06:10 PM   #7
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Default Re: 8 Volt battery charge ???

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Originally Posted by sunking View Post
Assuming the battery is a 200 to 225 AH capacity no reason to limit the charge current to less than 20 - to 22 amps (C/10) You just do not want to go above the C/8 rate.

You can use the 12 volt charger on a 8 volt battery. The charger will go into constant current limit mode. You want to remove the charge when you reach 9.8 volts for 100 % capacity (2.45 vpc).

Where do you come up with 9.8 volts = 100% capacity? Trojan says their 8v battery is at 100% when it has 8.49 volts. Are they wrong? And what is C/10? And what about temperature monitoring?
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Old 11-25-2009, 08:38 AM   #8
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Default Re: 8 Volt battery charge ???

? is 9.89 Volts , the active charge it takes to get to 8.49 after unplugging and allowing surface charge to dissipate ????
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Old 11-25-2009, 08:47 AM   #9
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Default Re: 8 Volt battery charge ???

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? is 9.89 Volts , the active charge it takes to get to 8.49 after unplugging and allowing surface charge to dissipate ????
Well that would depend upon a lot of factors... Most importantly would be battery temperature... you might spike to that level? I dunno? I do not like to take them above 9v and those at 9v will settle to 8.4 again depending upon age and health and how long at what amperage they were at 9v...... Charging 8v batts with a 12v charger is not something you plug in and walk away from..... it really has to be done at very low amperage to be safe.
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Old 11-25-2009, 10:57 AM   #10
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Default Re: 8 Volt battery charge ???

hey scottyb thanks for the reply , the ? was for sunking since he made the statement.

I found this though, which I thought was interesting http://www.engineersedge.com/battery...ry_ratings.htm
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