Publication No: EN-ODY-TM-0002 - February 2015
www.odysseybattery.com
12
(B) How long can the battery be stored?
ODYSSEY batteries should be fully charged prior to storage.
Fully charged ODYSSEY batteries can be stored for up to
24 months at 25ºC. Battery voltage naturally decreases with
time and with increased temperature. The battery voltage
should be checked periodically. If the battery voltage drops
to 12.0 volts (35% state of charge) it should be recharged
immediately to avoid permanent battery damage. The
following can be used as a rough approximation for the
potential storage times at different temperatures.
Figure 3: ODYSSEY
®
battery storage time at
temperatures
Storage Temperature (ºC)
Storage Time (Months)
5
48
15
36
25
24
35
12
45
6
(C) Can the battery recover from deep discharge
conditions?
Yes, the ODYSSEY battery can recover from extremely deep
discharges as the following test results demonstrate.
(1) German DIN standard test for overdischarge recovery
In this test, a PC925 was discharged over 20 hours (0.05C
10
rate)
2
. After the discharge
2
a 5
£
resistor was placed across
the battery terminals and the battery kept in storage for 28
days.
At the end of the storage period, the battery was charged
at 13.5V for only 48 hours. A second 0.05C
10
discharge
yielded 97% of rated capacity, indicating that a low rate
48-hour charge after such a deep discharge was insufficient;
however, the intent of the test is to determine if the battery
is recoverable from extremely deep discharges using only
a standby float charger. A standard automotive charger at
14.4V would have allowed the battery to recover greater
than 97% of its capacity.
These test results prove that ODYSSEY batteries can
recover from deep discharge conditions. Reinforcing this
conclusion is the next test, which is even harsher than the
DIN standard test, because in this test the battery was
stored in a discharged state at a temperature of 50°C.
(2) High temperature discharged storage test
Two PC1200 samples were discharged in this test at the
1-hour rate to 9V per module, and then placed in storage at
50°C for 4 weeks.
At the end of 4 weeks, the two batteries were recharged
using a constant voltage (CV) charge at 14.7V per battery.
As Figure 4 below shows, both samples recovered from this
extreme case of abusive storage.
Figure 4: Recovery from high temperature discharged
storage
Extreme cold temperature performance
High discharge rate performance in extremely cold
conditions is another area in which ODYSSEY
®
batteries
excel. An example of this is shown in Figure 5. Even at
-40°C the battery was able to support a 550A
load for over 30 seconds before its terminal voltage
dropped to 7.2V.
Figure 5: CCA test @ -40°C on 31-PC2150
Since all ODYSSEY batteries are designed similarly, one can
expect similar outstanding cold temperature performance
from any of the other ODYSSEY batteries.
Cycle number
10
8
6
4
2
0
12
14
16
18
36
34
32
30
28
26
24
22
20
Sample 1
Sample 2
Capacity at the 1-hr rate
Constant voltage recharge at 14.7V per module
Current limit for cycles 1 & 2 : 0.125C
10
Current limit for cycles 3 - 16 : 1C
10
2The C10 rate of charge or discharge current in amperes is numerically equal to the 10 hour rated capacity of a battery in ampere-hours
divided by 10. Thus, a 26Ah battery at the 10-hour rate, such as the PC925, would have a C10 rate of 2.6A.
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
0
5
10
15
20
25
30
35
40
V
oltage
Run time in seconds
Voltage profile at 550A discharge
30 seconds (test requirement)
7.2V
34.1 Secs.
