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6. Maintenance and Inspection
The sealed lead battery used in the unit has a limited life.
(The life varies depending on your storage/use environment and backup frequency.)
The nearer the end of the life is, the more rapidly deterioration proceeds.
1. Life of battery (estimated replacement timing)
2. Methods for checking the battery
There are 3 methods for checking the battery.
• Perform a self-diagnostic test. (See page 39.)
• Use the auto battery test function. (See page 40.)
• Measure the backup time. (See page 49.)
By measuring the backup time, the battery life can be determined more accurately.
See also
Measure the backup time according to "5-1 How to measure backup time"
➛
Page 49
If the measured value is equal to the "initial value of the backup time" or less than half the value
obtained from the graph of "Estimated backup time" on page 49 , replace the battery.
• When you compare the "initial value of the backup time" you measured and the current backup
time, make the capacity of devices connected to the UPS same as when you measured the initial
value to make judgment accurately.
3. Guidelines for how often to check the battery (measure the backup time)
* The battery deteriorates even if it is stored. The higher the temperature is, the shorter the
life becomes.
Ambient temperature
20°C
30°C
Check once every 6 months
For the fi rst 3 years after purchase
For the fi rst 1.5 years after purchase
Check once a month
When 3 or more years have passed since purchase
When 1.5 or more years have passed since purchase
Ambient temperature
20°C
30°C
Life of battery
4 to 5 years
2 to 2.5 years
Replacement estimation
4 to 5 years after staring use
2 years after staring use
6-1
Checking the battery
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