Rockwell Automation Publication 1756-UM001M-EN-P - February 2012 77
Start Using the Controller Chapter 3
Do not decrease the time after the BAT status indicator turns on.
1756-BATM Battery Module and Battery Life
Use the 1756-BATM battery module with any 1756-L6x, series A controller. The
battery module is highly recommended for the higher-memory controllers.
When the 1756-BATA battery within the 1756-BATM module is approximately
50% discharged, these low-battery warnings are indicated:
• The BAT is solid red.
• A minor fault (type 10, code 10) is logged.
If the BAT status indicator turns on when you apply power to the controller,
the remaining battery life may be less than this table indicates. Some of
the battery life may have been used up while the controller was off and
unable to turn on the BAT status indicator.
Table 13 - Worst-case Estimates of 1756-BA1 Battery Life
Temperature Battery Life Before BAT Status Indicator Turns On Battery Life After BAT Status Indicator Turns On
and Power is Cut Off
Power Off 100% Power Off 50% Yearly Decrease
60 °C (140 °F) 22 days 43 days 23% 6 hrs
25 °C (77 °F) 21 days 42 days 17% 28 hrs
0 °C (32 °F) 14 days 28 days 17% 2.5 days
Table 14 - Worst-case Estimates of 1756-BATA Battery Life
Temperature Battery Life Before BAT Status Indicator Turns On Battery Life After BAT Status Indicator Turns On
and Power is Cut Off
Power Off 100% Power Off 50% Yearly Decrease
60 °C (140 °F) 98 days 204 days 11% 104 days
25 °C (77 °F) 146 days 268 days 5% 157 days
0 °C (32 °F) 105 days 222 days 6% 113 days
If your project is Then use of the 1756-BATM battery module is
Not stored in nonvolatile memory Highly recommended
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