Panasonic FP0R - Built-In Backup Battery; Time the Built-In Backup Battery Can be Used (Backup Time); Relation between Charging Time and Backup Time; Predicted Life of Built-In Backup Battery

2-11
2.4.2 Built-in Backup Battery
Time the built-in backup battery can be used (Backup time)
The built-in backup battery is not charged when the unit is shipped.
Charge the battery sufficiently before use. (Full charge (Ambient temperature: 25°C): 72 hours)
It will be charged automatically if the DC power is supplied to the control unit.
Relation between charging time and backup time
The number of days in the backup time varies according to the rate of charging time.
If it is charged on a full charge (72 hours) at the ambient temperature of 25
°C, the backup time
will be approx. 50 days.
The backup time will vary according to the ambient temperature when the battery is charged.
Ambient temperature when charged
Number of days in backup time
70 °C Approx. 14 days
-20
°
C
Approx. 25 days
Predicted life of built-in backup battery
The life of the built-in backup battery varies according to the ambient temperature while the control unit is
on (energized).
Note) The temperature when the control unit is off (not powered) has little influence on the battery life.
Ambient temperature
Lifetime of built-in backup battery
55 °C Approx. 430 days <Approx. 1 year>
45
°
C
Approx. 1200 days <Approx. 3 years>
40 °C Approx. 2100 days <Approx. 6 years>
35
°
C
Approx. 3300 days <Approx. 9 years>
34 °C or lower Approx. 10 years
Note: The built-in backup battery cannot be replaced.