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[VAC] Battery discharge rates

For liquid lead acid batteries,

Open Circuit Voltage = 12.65 VDC, charge = 100%
Open Circuit Voltage = 12.35 VDC, charge = 75% 
Open Circuit Voltage = 12.10 VDC, charge = 50%
Open Circuit Voltage = 11.80 VDC, charge = 25%
Open Circuit Voltage < 11.50 VDC, charge = discharged


For gel cell and AGM (absorbed glass mat) batteries,

Open Circuit Voltage = 12.85 VDC, charge = 100%
Open Circuit Voltage = 12.65 VDC, charge = 75% 
Open Circuit Voltage = 12.40 VDC, charge = 50%
Open Circuit Voltage = 12.20 VDC, charge = 25%
Open Circuit Voltage < 12.00 VDC, charge = discharged


Once a battery has been discharged 50% or more, permanent damage is
induced into the battery.  This induced damage will drastically shorten
the life span of the battery regardless of the type of battery.


Tom H.
'53 Flying Cloud
WDCU