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Open Circuit Voltage Vs State of Charge

Using a Digital Voltmeter
% Charge
Flooded Type
Absorb / SLA Type
Gel Type
-

Calcium/Calcium

Lead Antimony

-
-
100
12.80
12.65
12.90 - 12.80
12.95 - 12.85
75
12.65
12.45
12.60
12.65
50
12.44
12.24
12.30
12.35
25
12.19
12.06
12.00
12.00
0
11.97 or less
11.89 or less
11.80
11.80
Note: Divide values in half for 6-volt batteries. The true open circuit voltage of a battery can only be determined after the battery has been removed from the load (charge or discharge) for 24 hrs.
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