Murphy BCEG-24-20 - Manual (Page 17)

Section 75 00-02-0615
02-29-08 - 13 -
NOTE: On this method, providing batteries have been sized correctly for engine
and charged correctly, an open terminal voltage of 12.5V or greater should be
present.
The following table is for Lead Acid batteries with removable vent caps that can have
electrolyte or distilled water added to them for routine maintenance.
% Charge Specific Gravity
Voltage (DC) on
a 12V battery
100 1.265 12.8
75 1.225 12.5
50 1.19 12.4
25 1.155 12.0
Discharged 1.12 11.5
NOTE: If the voltage across the terminals shows around 10.5V, this may
indicate a shorted cell is present.