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P. 303-800-4725 F. 303-600-9726 BD Batteries - Broomfield & Denver Colorado - Deep Cycle AGM Batteries
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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.

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P. 303-800-4725 F. 303-600-9726
Mail to: 138 5023 West 120th Ave. Broomfield, CO 80020
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P. 303-800-4725 F. 303-600-9726 BD Batteries - Broomfield & Denver Colorado - Deep Cycle AGM Batteries Lifeline Batteries, Total Power Batteries, Rock Racing Battery Line, Optima Battery Lines & Sun Xtender Batteries

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

Battery Load Voltage vs. DOD (Depth of Discharge)

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

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Official Battery Distributor for: Lifeline Battery, Sun Xtender Battery, Total Power Battery, and Rock Racing Batteries. BD Batteries; AGM Batteries, Battery Chargers, Batttery Inverters, DC Fuses, Firewall Pass Throughs, DC Diodes, and Special Order Flooded Crown Batteries!

P. 303-800-4725 F. 303-600-9726 BD Batteries - Broomfield & Denver Colorado - Deep Cycle AGM Batteries
Lifeline Batteries, Total Power Batteries, Rock Racing Battery Line, Optima Battery Lines & Sun Xtender Batteries

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

Official Battery Distributor for:
Lifeline Battery, Sun Xtender Battery, Total Power Battery, and Rock Racing Batteries.
BD Batteries; AGM Batteries, Battery Chargers, Batttery Inverters, DC Fuses, Firewall Pass Throughs, DC Diodes, and Special Order Flooded Crown Batteries!