En-Opzv-Pg-002 - Enersys - EMEA

2 - Battery cycling
Definition
Battery cycling implies use in a regular cycle, with
full discharge followed by re-charging on a daily or
weekly basis for example.
The number of such cycles which can be obtained
is typically over 1200, in conformity with the
IEC896-2 (1995).
3 - Effect of temperature
on battery capacity
The temperature has an effect on the battery capacity
available. The following table gives the relevant
details for a temperature of 20°C.
Discharge time
(hours)
1
3
5
10
12 to 24
4 - Temperature range
The ideal ambient temperature for PowerSafe OPzV
batteries is 20°C ± 5°C (best performance and service
life) The operating temperature shall be in the range of
10 and 35°C
The maximum and minimum permissible temperature
is 45°C and -10°C.
Important note : For all applications which use the
PowerSafe ® OPzV type battery in a cycling system,
it is recommended that the technical department of
EnerSys ® should be contacted so that the technical
parameters can be specified for the precise cycling
programme in question.
Correction factor for capacity calculation according to temperature
(the reference temperature is 20°C)
-10°C 0°C 10°C 20°C 30°C 40°C
0.37 0.61 0.82 1.00 1.05 1.07
0.51 0.70 0.85 1.00 1.05 1.06
0.55 0.73 0.87 1.00 1.04 1.06
0.58 0.75 0.88 1.00 1.04 1.05
0.60 0.78 0.91 1.00 1.03 1.05
5 - Effect of temperature on life
Operation of valve regulated batteries at
temperatures higher than 20°C will reduce life
expectancy. Higher temperature increases the speed
of chemical reactions resulting in reduction of service
life. A temperature increase of 10°C decreases the
service life to half (law of Arrhenius)
8 www.enersys-emea.com
Publication No: EN-OPzV-PG-002 - January 2011