We are going to replace the entire PERC 740P RAID controller which includes a battery on it (Y2RV2) and see how that goes. Shouldn't have to since everything is running fine as is minus those battery error messages. Keep you posted. INSTALLING THE PERCDell T440: [URL] Please note the lettering for Ports A and B on both the cable and the PERC and connect them respectively. Please also have the battery plugged into and seated on the PERC before installing the PERC. You do not need to move your drives. IMPORTING THE RAID CONFIGURATION FROM YOUR DRIVESImporting the foreign raid configuration from the drives: [URL]~en/documents~esupport-qrl-perc-import-foreign-config-en-v1.aspx Once installed and system ready to power on, power on the system and prepare to press and enter (F2) System Setup. In System Setup, navigate to Device Settings and access your PERC (H740P). Access the Configuration Management menu, then navigate to "Manage Foreign Configuration". If it says to, click on "Preview Configuration" then click "Import Foreign Configuration"; If it simply says "Import Foreign Configuration", then click that. Do NOT click "Clear Foreign Configuration", as this will remove the raid configuration from the drives.  Confirm then proceed. You should be able to see your drives in the Virtual Disk Management. You may now exit the System Setup. The system may reboot, and everything should now be connected. The drives may undergo a background initialization, but there shouldn't be downtime. You should be able to exit System Setup and boot into your OS right away. Recommendation to backup your data before the hardware replacement.
The Dell T440 server was running perfectly and showed “Healthy” status. Prior to update to Firmware 51.13.2-3714 and Driver 7.710.07.00 on PERC H740P. I did the Dell updates to fix a bunch of vulnerabilities and now I’m getting System Has Critical Issues. I don’t understand how the system can be “Healthy” and then all of a sudden do this after firmware updates. Makes no sense. Does the battery really need to be replaced? I tried doing a cold boot, iDRAC reset, searched the internet for other solutions and doesn’t seem to go back to green healthy. The only thing I haven’t tried is shutting down the server and unplugging the power cords, waiting 2 minutes and powering everything back on. I also read online someone said to blow canned air into the RAID controller card slot and reseat the card. Is this a bug in the latest firmware or has the battery really failed? The PERC1 battery has failed. PERC1 ROMB Battery = State Failed Battery on RAID Controller in Slot 5 = State Removed
The PERC1 battery has failed. PERC1 ROMB Battery. State Removed. PERC H740P 
Dell T440