Ivan Jager

On Sun, 1 Apr 2007, Jeff Strickland wrote:
>
> "Mike" <mik@localnet.com> wrote in message
> news:SfOPh.5849$B25.1882@news01.roc.ny...
>>
>> "Jeff Strickland" <crwlr@verizon.net> wrote in message
>> news:szAPh.368$jZ3.275@trnddc06...
>>>
>>> "Mike" <mik@localnet.com> wrote in message
>>> news:ClwPh.5969$ya1.4904@news02.roc.ny...
[...]
>>>> First start with a known good battery. A fully charged battery should
>>>> read around 12.65 volts. The voltage reading you got when ckecking your
>>>> battery, 11.96, indicates a battery that is 80% DISCHARGED.
>>>>
>>>>
>>>>
>>>
>>> 80% discharged!? No, how about 20% discharged?.
>>>
>>> Actually, 11.96 is 94.5% of 12.65. This makes the discharge rate to be
>>> less than 6%.
>>
>>
>> Actually about 11.88 is 100% discharged so you need to redo your math.
>> Like I said before, a voltage reading of 11.96 indicates an 80% discharged
>> battery.
>>
>
> Sorry, I don't follow you. Please 'splain me it.

A battery is not like a capacitor. While the voltage and charge still are
related, it is not a linear relation. First hit on google actually seems
to agree with Mike. http://www.wind-sun.com/PDF_Files/battvoltandsoc.pdf


> I'm pretty sure my cars start easily with 11.88 vDC. It's not even close to
> being fully discharged.

If your battery is putting out 11.88 V while you are cranking, sure. If
that's your battery's voltage at rest and it still has that much charge, I
imagine you must have a very large battery.

Ivan

Ivan Jager

On Sun, 1 Apr 2007, Jeff Strickland wrote:
>
> "Mike" <mik@localnet.com> wrote in message
> news:SfOPh.5849$B25.1882@news01.roc.ny...
>>
>> "Jeff Strickland" <crwlr@verizon.net> wrote in message
>> news:szAPh.368$jZ3.275@trnddc06...
>>>
>>> "Mike" <mik@localnet.com> wrote in message
>>> news:ClwPh.5969$ya1.4904@news02.roc.ny...
[...]
>>>> First start with a known good battery. A fully charged battery should
>>>> read around 12.65 volts. The voltage reading you got when ckecking your
>>>> battery, 11.96, indicates a battery that is 80% DISCHARGED.
>>>>
>>>>
>>>>
>>>
>>> 80% discharged!? No, how about 20% discharged?.
>>>
>>> Actually, 11.96 is 94.5% of 12.65. This makes the discharge rate to be
>>> less than 6%.
>>
>>
>> Actually about 11.88 is 100% discharged so you need to redo your math.
>> Like I said before, a voltage reading of 11.96 indicates an 80% discharged
>> battery.
>>
>
> Sorry, I don't follow you. Please 'splain me it.

A battery is not like a capacitor. While the voltage and charge still are
related, it is not a linear relation. First hit on google actually seems
to agree with Mike. http://www.wind-sun.com/PDF_Files/battvoltandsoc.pdf


> I'm pretty sure my cars start easily with 11.88 vDC. It's not even close to
> being fully discharged.

If your battery is putting out 11.88 V while you are cranking, sure. If
that's your battery's voltage at rest and it still has that much charge, I
imagine you must have a very large battery.

Ivan

Greg

After reading Bills page, me thinks I need a new battery.

"L.W. (Bill) ------ III" <----------@***.net> wrote in message
news:46100fa6$0$16343$88260bb3@free.teranews.com.. .
> STATE-OF-CHARGE TEST at about a quarter down the page of:
> http://www.repairfaq.org/ELE/F_Car_B...CARBATTERY_003
> God Bless America, Bill 0|||||||0
> mailto:-------------------- http://www.----------.com/
>
>
> "Jeff Strickland" <crwlr@verizon.net> wrote in message
> news:NnQPh.1776$_43.1361@trnddc02...
>>
>> Sorry, I don't follow you. Please 'splain me it.
>>
>> I'm pretty sure my cars start easily with 11.88 vDC. It's not even close
> to
>> being fully discharged.
>
>
>
> --
> Posted via a free Usenet account from http://www.teranews.com
>

Greg

After reading Bills page, me thinks I need a new battery.

"L.W. (Bill) ------ III" <----------@***.net> wrote in message
news:46100fa6$0$16343$88260bb3@free.teranews.com.. .
> STATE-OF-CHARGE TEST at about a quarter down the page of:
> http://www.repairfaq.org/ELE/F_Car_B...CARBATTERY_003
> God Bless America, Bill 0|||||||0
> mailto:-------------------- http://www.----------.com/
>
>
> "Jeff Strickland" <crwlr@verizon.net> wrote in message
> news:NnQPh.1776$_43.1361@trnddc02...
>>
>> Sorry, I don't follow you. Please 'splain me it.
>>
>> I'm pretty sure my cars start easily with 11.88 vDC. It's not even close
> to
>> being fully discharged.
>
>
>
> --
> Posted via a free Usenet account from http://www.teranews.com
>

Greg

After reading Bills page, me thinks I need a new battery.

"L.W. (Bill) ------ III" <----------@***.net> wrote in message
news:46100fa6$0$16343$88260bb3@free.teranews.com.. .
> STATE-OF-CHARGE TEST at about a quarter down the page of:
> http://www.repairfaq.org/ELE/F_Car_B...CARBATTERY_003
> God Bless America, Bill 0|||||||0
> mailto:-------------------- http://www.----------.com/
>
>
> "Jeff Strickland" <crwlr@verizon.net> wrote in message
> news:NnQPh.1776$_43.1361@trnddc02...
>>
>> Sorry, I don't follow you. Please 'splain me it.
>>
>> I'm pretty sure my cars start easily with 11.88 vDC. It's not even close
> to
>> being fully discharged.
>
>
>
> --
> Posted via a free Usenet account from http://www.teranews.com
>

L.W. \(Bill\) Hughes III

Bill's Google link, not worth bookmarking.
God Bless America, Bill 0|||||||0
mailto:-------------------- http://www.----------.com/

"Greg" <greglc84@hotmail.com> wrote in message
news:iJXPh.15568$DE1.9660@pd7urf2no...
> After reading Bills page, me thinks I need a new battery.



--
Posted via a free Usenet account from http://www.teranews.com

L.W. \(Bill\) Hughes III

Bill's Google link, not worth bookmarking.
God Bless America, Bill 0|||||||0
mailto:-------------------- http://www.----------.com/

"Greg" <greglc84@hotmail.com> wrote in message
news:iJXPh.15568$DE1.9660@pd7urf2no...
> After reading Bills page, me thinks I need a new battery.



--
Posted via a free Usenet account from http://www.teranews.com

L.W. \(Bill\) Hughes III

Bill's Google link, not worth bookmarking.
God Bless America, Bill 0|||||||0
mailto:-------------------- http://www.----------.com/

"Greg" <greglc84@hotmail.com> wrote in message
news:iJXPh.15568$DE1.9660@pd7urf2no...
> After reading Bills page, me thinks I need a new battery.



--
Posted via a free Usenet account from http://www.teranews.com

Lon

Mike proclaimed:
> "Jeff Strickland" <crwlr@verizon.net> wrote in message
> news:szAPh.368$jZ3.275@trnddc06...
>
>>"Mike" <mik@localnet.com> wrote in message
>>news:ClwPh.5969$ya1.4904@news02.roc.ny...
>>
>>>"Greg" <greglc84@hotmail.com> wrote in message
>>>news:p_uPh.4647$aG1.3248@pd7urf3no...
>>>
>>>>I read the rest of the replies, mostly argueing about resistence, anyway
>>>>Mike I cleaned all connections on bat. solinoid, and alt. only one I
>>>>didn't clean was one down at starter, and starter and bat cables are
>>>>about a year old.
>>>> Bill mentioned at some point bat. was disconnected while running, that
>>>>didn't happen, but when I thought the bat. was dead the other day I used
>>>>my battery charger which has a setting for 70 amps to start a vehicle,
>>>>which I used and it arced when disconncting it. I replaced everything on
>>>>engine when I put a rebuilt in 1 1/2 years ago, all but alt. Am I now
>>>>ready for that?
>>>
>>>
>>> First start with a known good battery. A fully charged battery should
>>>read around 12.65 volts. The voltage reading you got when ckecking your
>>>battery, 11.96, indicates a battery that is 80% DISCHARGED.
>>>
>>>
>>>
>>
>>80% discharged!? No, how about 20% discharged?.
>>
>>Actually, 11.96 is 94.5% of 12.65. This makes the discharge rate to be
>>less than 6%.
>
>
>
> Actually about 11.88 is 100% discharged so you need to redo your math.
> Like I said before, a voltage reading of 11.96 indicates an 80% discharged
> battery.

Open circuit voltage of 11.7 is 0%
With a load and/or at lower temperature, the voltage is much less.
12.0 open circuit is a 25% charge but under load expect something more
like 8-9 volts at zero degrees F, with the complication that a battery
with less than 9-10 volts open circuit will tend to charge very slowly
at first.

Lon

Mike proclaimed:
> "Jeff Strickland" <crwlr@verizon.net> wrote in message
> news:szAPh.368$jZ3.275@trnddc06...
>
>>"Mike" <mik@localnet.com> wrote in message
>>news:ClwPh.5969$ya1.4904@news02.roc.ny...
>>
>>>"Greg" <greglc84@hotmail.com> wrote in message
>>>news:p_uPh.4647$aG1.3248@pd7urf3no...
>>>
>>>>I read the rest of the replies, mostly argueing about resistence, anyway
>>>>Mike I cleaned all connections on bat. solinoid, and alt. only one I
>>>>didn't clean was one down at starter, and starter and bat cables are
>>>>about a year old.
>>>> Bill mentioned at some point bat. was disconnected while running, that
>>>>didn't happen, but when I thought the bat. was dead the other day I used
>>>>my battery charger which has a setting for 70 amps to start a vehicle,
>>>>which I used and it arced when disconncting it. I replaced everything on
>>>>engine when I put a rebuilt in 1 1/2 years ago, all but alt. Am I now
>>>>ready for that?
>>>
>>>
>>> First start with a known good battery. A fully charged battery should
>>>read around 12.65 volts. The voltage reading you got when ckecking your
>>>battery, 11.96, indicates a battery that is 80% DISCHARGED.
>>>
>>>
>>>
>>
>>80% discharged!? No, how about 20% discharged?.
>>
>>Actually, 11.96 is 94.5% of 12.65. This makes the discharge rate to be
>>less than 6%.
>
>
>
> Actually about 11.88 is 100% discharged so you need to redo your math.
> Like I said before, a voltage reading of 11.96 indicates an 80% discharged
> battery.

Open circuit voltage of 11.7 is 0%
With a load and/or at lower temperature, the voltage is much less.
12.0 open circuit is a 25% charge but under load expect something more
like 8-9 volts at zero degrees F, with the complication that a battery
with less than 9-10 volts open circuit will tend to charge very slowly
at first.