Figure 2 shows the relationship between open
circuit voltage (OCV) and state of charge (SOC) for
the ODYSSEY
®
Extreme Racing™ battery.
(A) How do I know the state of charge of the
battery?
Figure 2: ODYSSEY
®
Extreme Racing™
Battery OCV vs. SOC
As long as the battery has not been charged or
discharged for 6 or more hours, Figure 2 can be
used to determine the SOC of the ODYSSEY
Extreme Racing battery. Use a high quality digital
voltmeter to measure its OCV. The graph shows
that a healthy, fully charged ODYSSEY Extreme
Racing battery will have an OCV of 12.84V or
higher at 25ºC.
(B) How long can the battery be stored?
Refer to Figure 3 below. At 25°C (77ºF), these
batteries can be stored for up to 2 years. The
lower the temperature, the longer the storage time.
The battery must be charged before storage.
Roughly every 10°C (18°F) increase in temperature
cuts storage time in half. If the temperature rises
to 35°C (95°F) the battery may be stored for only 1
year before a recharge becomes necessary. Figure
3 will apply only if the battery is fully charged
before storage.
State of Charge (SoC), %
open cir
cuit voltage (oCV),
V
13.0
12.8
12.6
12.4
12.2
12.0
11.8
11.6
10
20
30
40
50
60
70
80
90
100
12.84V or higher indicates
100% SoC
Per
cent of 0.05C capacity
100
90
80
70
60
50
40
30
open circuit storage time in weeks
10
20
30
40
50
60
70
0
25°C
45°C
65°C
www.odysseybattery.com
5
oDYSSEY
®
EXTREME RACING
™
BATTERY SToRAGE
AND DEEP DISCHARGE RECoVERY
Figure 3: ODYSSEY
®
Extreme Racing™
Battery storage time at temperatures
Publication No. 2602-0093 US-ODY-ER-OM-001 - October 2008
