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Leisure Battery



 
 
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  #1 (permalink)  
Old May 16th 05, 09:32 AM posted to uk.rec.motorcaravans
Gareth Williams
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Posts: 7
Default Leisure Battery

Hi,
Can anyone tell me what voltage, a standard battery should be when
fully charged

Thanks Gareth


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  #2 (permalink)  
Old May 16th 05, 10:29 AM posted to uk.rec.motorcaravans
John Sangwin[_2_]
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Posts: 49
Default Leisure Battery

In message dated Mon, 16 May 2005, Gareth Williams wrote:

Can anyone tell me what voltage, a standard battery should be when
fully charged


12.8 volts, after it has been at rest for a few hours.

John
--

  #3 (permalink)  
Old May 16th 05, 11:41 AM posted to uk.rec.motorcaravans
Mike Williams[_2_]
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Posts: 42
Default Leisure Battery

"Gareth Williams" wrote in message
...

Hi, Can anyone tell me what voltage, a standard battery
should be when fully charged


It depends how you measure it. The open circuit voltage of a battery is not
a very good indicator of its state of charge. You should take the
measurement either when the battery is being charged (by a normal battery
charger, not by the alternator) or when it is being discharged (preferably
by a small current in the region of a couple of amps or so). Other tests can
be performed at much higher discharge currents, but these tests are normally
used for checking things other than simply the amount of charge the battery
currently contains.

During charge the voltage will rise to about 14.1 volts at a point in time
when the battery is about half to two thirds charged. Normally most battery
chargers would then provide a relatively small "charging voltage" (by any
one of a number of different means) and the battery then usually takes a
further two hours or so to complete its charge cycle.

During discharge (for a current in the range of a couple of amps or so) a
fully charged battery will have a terminal voltage of about 12.9 volts.

Mike




  #4 (permalink)  
Old May 16th 05, 06:19 PM posted to uk.rec.motorcaravans
Gareth Williams
external usenet poster
 
Posts: 7
Default Leisure Battery

Thanks All
"Mike Williams" wrote in message
...
"Gareth Williams" wrote in message
...

Hi, Can anyone tell me what voltage, a standard battery
should be when fully charged


It depends how you measure it. The open circuit voltage of a battery is
not a very good indicator of its state of charge. You should take the
measurement either when the battery is being charged (by a normal battery
charger, not by the alternator) or when it is being discharged (preferably
by a small current in the region of a couple of amps or so). Other tests
can be performed at much higher discharge currents, but these tests are
normally used for checking things other than simply the amount of charge
the battery currently contains.

During charge the voltage will rise to about 14.1 volts at a point in time
when the battery is about half to two thirds charged. Normally most
battery chargers would then provide a relatively small "charging voltage"
(by any one of a number of different means) and the battery then usually
takes a further two hours or so to complete its charge cycle.

During discharge (for a current in the range of a couple of amps or so) a
fully charged battery will have a terminal voltage of about 12.9 volts.

Mike






 



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