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BD Batteries - Determining the State of Charge(SOC) for a Lifeline AGM Battery

Battery Load Voltage vs. DOD (Depth of Discharge)

Below are listed the 1 hour, 8 hour, 20 hour and 120 hour load voltages during the discharge cycle from full charge to 100% discharge to 1.75V/cell or 10.5V (6 cells) at 25°C (77°F).
DOD (%) 1 hr. Rate 8 hr. Rate 20 hr. Rate 120 hr. Rate
10 12.23 12.62 12.65 12.79
20 12.16 12.51 12.55 12.69
30 12.07 12.39 12.42 12.55
40 11.96 12.25 12.28 12.40
50 11.83 12.11 12.13 12.22
60 11.70 11.96 11.98 12.08
70 11.55 11.79 11.81 11.90
80 11.38 11.59 11.61 11.70
90 11.15 11.32 11.34 11.43
100 10.50 10.50 10.50 10.50
Please note that these voltages are averages and will vary slightly from battery to battery even of the same rating. They are, however, a good indicator of state of charge and can be used when setting low voltage alarms or disconnects for a Concorde AGM battery. Other battery types or manufacturers voltage vs. DOD may be substantially different. The data is for newer batteries with relatively few cycles. An older battery will measure a lower voltage for a given DOD.

SOC (%) vs. OCV
the battery State Of Charge vs battery's Open Circuit Voltage

An easy method to estimate the State of Charge (SOC) of the battery is by measuring its Open Circuit Voltage (OCV). This measurement should be made after the battery has been at rest for a minimum of four hours with the battery shut off from its charging source and load. The voltage is listed as Volts/cell and for a 12V (6 cell) battery at 25°C (77°F).

State of Charge (%)OCV per cell OCV per 12V battery
100 2.17 or greater 13.0 or greater
75 2.10 12.6
50 2.03 12.2
25 1.97 11.8
0 1.90 or less 11.4 or less

These voltage levels are approximate and give an indication of the state of charge of a battery at rest. As the battery ages these voltage measurements will be lower.

AGM Batteries Available

All Available AGM Batteries
Battery Comparison Table - AH & Capacity
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Lifeline Battery Dealer
Lifeline Deep Cycle AGM Battery Specifications
Lifeline Deep Cycle AGM Batteries by Size
Lifeline OEM - RV & Marine List
Lifeline AGM Battery Features
Lifeline AGM Battery SOC, OCV, and DOD Info
Lifeline AGM Battery Performance Graphs
Lifeline AGM Battery Charging Procedures
Lifeline AGM Batteries History
Lifeline AGM Batteries FAQ
Lifeline AGM Battery Safety
Battery, Inverter, and Generator Failover Calculator
AC - DC Lifeline AGM Battery Bank Sizing Calculator
DC - DC Lifeline AGM Battery Bank Sizing Calculator
DC Reserve Minutes Calculator
AGM Battery Users Manual Part 1 (1 of 2)
AGM Battery Users Manual Part 2 (2 of 2)
Sun Xtender Battery Dealer
Sun Xtender Deep Cycle AGM Battery Specifications
Sun Xtender Deep Cycle AGM Batteries by Size
Sun Xtender AGM Battery Features
3rd Party Sun Xtender AGM Battery Test Results
SunXtender AGM Battery Charging Procedures
Sun Xtender AGM Batteries History
Sun Xtender Battery Service Instructions
Sun Xtender Technical Documentation
AC - DC Sun Xtender AGM Battery Bank Sizing Calculator
DC - DC Sun Xtender AGM Battery Bank Sizing Calculator
Optima Battery Dealer
Optima Battery Features
Optima Red Top Battery Specifications
Optima Red Top Batteries by Size
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Optima Blue Top Batteries by Size
Optima Yellow Top Battery Specifications
Optima Yellow Top Batteries by Size


 Chairman Traction, Standby, and Wheelchair Batteries.
Chairman Traction / Standby / Wheelchair Batteries
Battery Chemistry Comparison - VRLA vs GEL vs AGM
Comparison Between Gel Batteries and AGM Batteries

Total Power Racing Battery Dealer
Total Power Racing Battery Features
Total Power AGM Racing Battery Specifications
Total Power Racing Lightweight Batteries by Size
Battery Chemistry Comparison - VRLA vs GEL vs AGM
Comparison Between Gel Batteries and AGM Batteries


Rock Racing Battery Dealer
Rock Racing Battery Features
Rock AGM Racing Battery Specifications
Total Power Racing Lightweight Batteries by Size
Battery Chemistry Comparison - VRLA vs GEL vs AGM
Comparison Between Gel Batteries and AGM Batteries


Shipping, Safety, and Legal

Lifeline, SunXtender, Total Power, and Rock Racing Battery Material Safety Data Sheet - MSDS (pdf)
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AGM Battery Applications and Benefits

AGM Battery Efficiency and Peukert Coefficients
Custom Uninterruptable Power Supply - Custom UPS
Uninterruptable Power Supply Kits - UPS Kits
Solar Powered Off Grid Housing

AGM Battery Installation Considerations

Hydrogen Venting Systems

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The information contain on this deep cycle AGM batteries website is deemed reliable, but not guaranteed. Please verify specific information on marine AGM batteries, rv AGM batteries or auto AGM batteries listed here by calling us direct. We are proud to offer the highest quality AGM batteries and hope you will consider using our deep cycle AGM batteries in the near future!