Figure 2 shows the relationship between open
circuit voltage (OCV) and state of charge (SOC)
for the ODYSSEY™ battery.
(A) How do I know the state of charge of
the battery?
Figure 2: ODYSSEY™ 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 battery. Use a high quality digital
voltmeter to measure its OCV. The graph shows
that a healthy, fully charged ODYSSEY 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
Publication No. 2602-0232, Rev. 6 - February 2008
www.odysseybattery.com
5
oDYSSEY
™
BATTERY SToRAGE AND DEEP DISCHARGE RECoVERY
Figure 3: ODYSSEY™ Battery storage time
at temperatures
