
Battery Life Information for Alkaline Batteries
370
870USE10110 July 2004
Lithium Battery
Characteristics
At an applied light duty load of 5 µA, the 1ACU009817 lithium battery can be
expected to outlast AAA alkaline batteries by a conservative factor of 2:1, given any
cutoff point or temperature.
The back-up life of the lithium battery when it is supporting the processor’s
memory while the processor is powered off is typically 3 years
The back-up life of the lithium battery when the processor is powered up and
running is typically 5 years
The capacity load lines showing lithium service life in the chart below are relatively
flat to EOL where alkaline capacity/voltage depletion starts at time zero.
At higher temperatures, alkaline aging accelerates well ahead of lithium. The 3.6 V
rating of this lithium battery is well above the 2.68 V battery-low threshold, further
supporting the improved and extended service life over the AAA alkalines.
Option Adapter
Battery Low
Threshold Level
A circuit monitors the voltage of the installed battery on the following modules:
172JNN21032 (Modbus) option adapter
172PNN21022 (Modbus Plus) option adapter
172PNN26022 (Modbus Plus) option adapter
This circuit sets the Battery Low Threshold level at 2.68 V. When the battery voltage
goes below this threshold level, the battery low indicator (if selected in the PLC
configuration) will come on (1). When the indicator comes on (1), you have 30 days
to replace the battery.
4.0
3.5
3.0
2.5
2.0
1.5
1.0
V
1
10
100 1000 10000
100000
hours
270 Ω
−13 µΑ
(0.9 Αη)
2.7 κΩ
−1.3 µΑ
(1.50 Αη)
6.8 κΩ
−0.5 µΑ
(1.65 Αη)
18 κΩ
−0.2 µΑ
(1.61 Αη)
100 κΩ
−36 µΑ
(1.33 Αη)
270 κΩ
−13 µΑ
(1.11 Αη)
Discharge Characteristics @ +25 degrees C
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