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Discussion Starter #1
Someone said, why is the most neg battery voltage is higher than the most
pos battery voltage.

I was checking all my battery logs that goes back to 1976 and found this may
be true while discharging the battery and reading the results in seconds
after the load is removed.

Yesterday I perform a load-charge test on my 6 volt U.S. Battery resulted in
the following:

After a 24 hour rest, the most pos and neg both read 6.44 volts.

Discharging the batteries for a 1.1 mile run at a battery ampere of 75 amps
and resting one minute, the most neg read 6.42 volts while the most pos read
5.41 volts.

Charging these batteries at 25 amps at 7.75 volts and resting one minute,
the most pos read 7.47 volts while the neg read 7.41 volts.

Resting at 30 minutes, the pos read 6.47 volts and the neg read 6.67 volts.

Resting for 23 hours, the most pos and neg both read 6.44 volts.

I found out long time ago, I do not have to worry that some of the voltages
may differ during certain conditions of charging and discharging.

It is noted that the battery capacity that is read in Marine Cranking Amp
(MCA) are very close even though the voltages may be different.

The most pos read 6.47 volts has a MCA rating of 1004 amperes and
The most neg read 6.41 volts has a MCA rating of 1021 amperes.

It is found that when any of the batteries have a higher voltage, is that
the MCA is lower and if any of the batteries have a lower voltage, is that
the MCA is higher. After about a 24 hour rest, the voltages become balance
and the MCA capacity remains the same.

Roland



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