TB 9-6140-252-13
EQUIPMENT DESCRIPTION AND DATA
CHARACTERISTICS
The Valve Regulated Lead-Acid (VRLA) battery's approximate State Of Charge (SOC) can be determined by
measuring its Open Circuit Voltage (OCV). For a "rested" battery (a battery that hasn't been charged or discharged
for at least eight hours) OCV and SOC are related as follows:
> 12.9 volts OCV: 95% - 100% SOC
12.7 volts OCV: about 80% SOC
12.5 volts OCV: about 60% SOC
12.3 volts OCV: about 50% SOC
12.1 volts OCV: about 35% SOC
11.9 volts OCV: about 20% SOC
11.7 volts OCV: about 10% SOC
11.5 volts OCV: about 5% SOC
< 11.4 volts OCV: 0% SOC
If the battery hasn't "rested" su ciently after charging, the voltage reading will be a bit higher than normal. If the
battery hasn't "rested" su ciently after discharging, the voltage reading may be a bit lower than normal.
DESCRIPTION
Several battery manufacturers make VRLA-AGM. They now come in all Battery Council International (BCI) groups;
they weigh 10-25% more than the equivalent ooded cell battery.
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