7-14
Life of the battery
Caution
Following example shows the life calculation of the back-up battery used in assumed ro-
bot operation.
2000[mAh] of battery capacity is used for calculation.
Note that the following value is not a guaranteed value, but only represents a calculated
value.
The values below were calculated with only the current consumption factored in. The cal-
culations do not factor in electrolyte leakage and other forms of battery deterioration.
Life time may be shortened depending on ambient condition.
1) 2 cycles/day
Annual consumption capacity =
(10 h × a + 0.0014 h × b + 2 h × c) × 2 × 313 days + 24 h × c × 52 days =
75.1 [mAh] )
Battery life = 2000 [mAh]/75.1 [mAh/year] = 26.6 [year]
2) 1 cycle/day
(2nd cycle of the above 1) is for rest.
Annual consumption capacity =
(10 h × a + 0.0014 h × b + 14 h × c) × 313 days + 24 h × c × 52 days =
168.9 [mAh] )
Battery life = 2000 [mAh]/168.9 [mAh/year] = 11.8 (11.841) [year]
a : Current consumption in normal mode 0 [µA]
b : Current consumption at power failure timer mode 90 [µA]
c : Current consumption at power failure mode 30 [µA]
Mon. to Sat. 313 days/365 day
Sun. 52 days/365 days
24 h
10 h 2 h
10 h 2 h
ON
OFF
Power
supply
24 h
a
c
b
c
b
a
c
2. Absolute system
Battery (for Backup) Installation
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