78 Rockwell Automation Publication 1756-UM001M-EN-P - February 2012
Chapter 3 Start Using the Controller
Estimate 1756-BA2 Battery Life
The 1756-BA2 batteries are for use in 1756-L6x controllers, series B. Use this
table to estimate how much time will elapse before the battery becomes low.
Table 15 - Worst-case Estimates of 1756-BA2 Life According to Temperatures and Power Cycles
Temperature 2.54 cm (1 in.) Below
the Chassis, max
Power Cycles Battery Life Before the BAT Status Indicator Turns Red
Project Size
1 MB 2 MB 4 MB 8 MB 16 MB
-25…35 °C (-13…95 °F) 3 per day 3 years 3 years 26 months 20 months 10 months
2 per day or less 3 years 3 years 3 years 31 months 16 months
41...45 °C (105.8...113 °F) 3 per day 2 years 2 years 2 years 20 months 10 months
2 per day or less 2 years 2 years 2 years 2 years 16 months
46...50 °C (105.8...113 °F) 3 per day or less 16 months 16 months 16 months 16 months 10 months
51...55 °C (123.8...131 °F) 3 per day or less 11 months 11 months 11 months 11 months 10 months
56…70 °C (132.8…158 °F) 3 per day or less 8 months 8 months 8 months 8 months 8 months
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