9 References
9-3 Battery life
BU100RS
9-3 Battery life
■ Battery has a limited life span.
Periodic checks of the lead battery used in the battery unit are required due to the battery
limited lifespan. For the battery checking method, refer to "4-1 Checking the battery".
Battery replacement is recommended before the battery is expired.
● Battery life
(The following is expressed based on the battery's trickle life, the service life of a battery
under the condition where low-frequent (once or twice a month) rechargings and
dischargings are performed.)
Battery type Expected battery life
(Ambient temperature 40°C)
Expected battery life
(Ambient temperature 30°C)
Expected battery life
(Ambient temperature 25°C)
UPS
Basically, the ambient temperature has a high influence on the battery life.
■ The periodic recharges are required even if the battery is stored.
The battery self-discharges even if the UPS is not used (i.e., leaving the battery not
charged), and it deteriorates the battery. In the worst case, the battery may become
unusable.
● Example of the storing condition and recharging frequencies
100
80
60
40
20
0
0 3 6 9 12 15
40°C 30°C 25°C
Storage period (Month)
Recharge line
Remaining
capacity (%)
<Description>
When the battery is stored at the storage temperature of 25°C, the battery self-discharges
(and the battery level lowers) to approximately 80% over half a year, and to approximately
50% over a year.
Higher the storage temperature is, faster the battery will self-discharge.
Auxiliary charging interval
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