Odyssey PC310, User Manual, Page: 6 / 8

(A) How do I know the state of charge
(SOC) of the battery?
Figure 2: ODYSSEY OCV vs. state of
charge
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 open circuit
voltage (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 charged before storage.
Figure 3: ODYSSEY storage time at
temperatures
State of Charge (SOC), %
O
p
e
n
ci
rcui
t
v
o
ltage (OC
V
),
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
Percent 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
°
C45
°
C65
°
C
6 Publication No: US-ODY-UG-001 - February 2005 www.odysseyfactory.com
Pulse discharge capabilities
Table 1 shows the 5, 10, 20 and 30-second pulse discharge numbers for these batteries
to 7.2V at 25ºC (77ºF). Sufficient time must be given between successive discharges to
allow the terminals to cool down. Also, fully charged batteries will meet these.
Battery Pulse discharge in amps to 7.2V
5 sec. 10 sec. 20 sec. 30 sec.
PC310 TBA TBA TBA TBA
PC535 535 465 410 380
PC545 545 495 420 380
PC680 680 595 525 400
PC625 625 545 480 450
PC925 925 870 765 675
PC1200 1,200 1,090 900 825
PC1700 1,700 1,540 1,355 1,195
PC2150 2,150 1,985 1,750 1,600
PC2250 2,250 2,075 1,775 1,675
Table 1: Pulse discharge of ODYSSEY batteries
ODYSSEY STORAGE AND DEEP DISCHARGE RECOVERY
Figure 2 shows the relationship between open circuit voltage (OCV) and state of
charge (SOC) for the ODYSSEY battery.