# Controller backup batteries S4 M94A

**URL:** https://tech-community.robotics.abb.com/t/controller-backup-batteries-s4-m94a/6181
**Category:** Robot Controller
**Created:** [June 13, 2014, 9:08pm UTC](https://tech-community.robotics.abb.com/t/controller-backup-batteries-s4-m94a/6181 "2014-06-13T21:08:57Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Simotion](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@Simotion](https://tech-community.robotics.abb.com/u/Simotion)
#### Post date: [June 13, 2014, 9:08pm UTC](https://tech-community.robotics.abb.com/t/controller-backup-batteries-s4-m94a/6181/1 "2014-06-13T21:08:57Z")

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If I install new backup batteries in the control cabinet of an S4 M94A,  
how low have do they have to be powered before I can cut the power (for  
approximately one minute) and to be sure that there will be no memory  
loss?