3
4.4 Daily Cycle
The battery is normally used with a daily cycle - charge during
the day hours and discharge during night hours. Typically, the
daily discharge usage is between 2 and 20% DoD.
4.5 Effect of Temperature on Capacity
If the ambient temperature deviates from 25°C, a correction
factor must be applied to the published rating in order to
optimise the service life (see Figure 1 below).
Figure 1
4.6 Operating Temperature Range
The recommended operating temperature range for optimum
life and performance is between 20°C to 25°C. PowerSafe
®
SBS
®
XC monoblocs/cells can be operated in the temperature
range -40°C to +50°C. In order to maintain mechanical
integrity of the plastic components, the battery temperature
in operation should not 50°C. Note, operation of
batteries at higher temperatures will reduce life expectancy. All
technical data relates to the rated temperature of +25°C.
4.7 Storage
Monoblocs and cells lose capacity when standing on open-
circuit because of parasitic chemical reactions. The high purity
of the materials used in the construction of PowerSafe SBS XC
batteries results in a very low rate of self-discharge, delivering
up to 2 years shelf life at 20°C before a refresh charge is
required.
The self-discharge rate of PowerSafe XC monoblocs and cells
is a function of the temperature. See below for the rate of self-
discharge at various temperatures:
Temperature
20°C
25°C
30°C
40°C
Monthly self-discharge
rate
1.25% 1.76% 2.5%
5%
Batteries should be stored in a cool, dry area. Note that high
temperature increases the rate of self-discharge and reduces
storage life. The following table gives the maximum storage
time before a refresh charge is required and the recommended
OCV audit intervals, at the given average storage ambient
temperature:
Temperature
(°C / °F)
Storage Time
(Months)
OCV Audit Interval
(Months)
+10 / +50
48
12
+15 / +59
34
12
+20 / +68
24
12
+25 / +77
17
6
+30 / +96
12
6
+35 / +95
8.5
3
+40 / +104
6
3
4.8 Refreshing Charge
Blocs and cells must be given a refreshing charge:
4.8.1
when the OCV approaches 2.10Vpc, or
4.8.2
when the maximum storage time is reached, whichever
occurs first.
Charge the monoblocs or cells at a constant voltage equivalent
to 2.40Vpc with minimum 0.1
C10
Amps current for a period of 24
hours.
4.9 Installation and Ventilation
The electrical protective measures and the accommodation
and ventilation of the battery installation must be carried out in
accordance with IEC 62485-2, and applicable “local” national
standards, rules and regulations.
The battery should be installed in a clean, dry area.
Whatever your application, PowerSafe SBS XC batteries can be
mounted in any orientation except inverted. For the installation
of cells in the horizontal position, the instructions below must
be complied with.
• Do not use terminal posts to lift or handle cells.
• Ensure that the stand runners are located under the
container rather than the lid and/or lid/container seal.
• Always ensure that the arrow on the lid of each unit is
pointing in vertical orientation.
Effect of Temperature on the 20 hour Discharge Performance
Shown as a Percentage of Normal Capacity @ 25ºC
Temperature (ºC)
% Performance @ 25ºC
140
120
100
80
60
40
20
0
-40 -30 -20 -10 0 10 20 30 40 50
+
-
+
-
+ -
