User's Manual

Chapter 4 Battery Care and Replacement
46 CCU 100 and Repeater 100 Installation Guide
Proprietary and Confidential
Battery Service Life
All batteries have extremely variable service life, depending upon the type of cycle,
environment, and charge to which the cell or battery is subjected during its life. There are
two basic types of service life: cycle life and calendar life. The battery in the CCU/Repeater
is called in to service only during power outages, so in this case only calendar (or float) life
is applicable.
Calendar Life
The design calendar (or float) life of the battery is up to eight to ten years at room
temperature (25°C/77°F) and under proper charging conditions.
This design life has been confirmed by the use of accelerated testing methods that are
widely accepted by both manufacturers and users of sealed-lead batteries. High
temperatures are used to accelerate the aging process of the battery under test.
The float life of a cell is cut in half for roughly every 8°C (14.4°F) rise in ambient
temperature. The example below shows the relationship between ambient temperature and
float life for batteries that have a float life of ten years at 25°C (77°F).
A ten year battery lasts for five years at 33°C (91.4°F) and only 2½ years at 41°C (105.8°F).
Preventative Maintenance
Itron recommends a preventative maintenance cycle of a two-year replacement in extreme
environments (average temperatures greater than 110°F/44°C), or five years in non-extreme
environments (average temperatures less then 90°F/31°C).