Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 279)

Error and Notification Messages
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The 3ware RAID controller checks the backup DCB, even when the primary
DCB is OK. If an error is found, the controller will attempt to correct the error
by reading the primary copy. If the primary copy is valid, the backup DCB
will be rewritten to rectify the errors.
Action
LSI recommends verifying the unit. See “Starting a Verify Manually” on
page 152.
0044 Battery voltage is normal
Event Type
Information
Cause
The battery pack voltage being monitored by the Battery Backup Unit fell
outside of the acceptable range and then came back within the acceptable
range.
Action
None required
0045 Battery voltage is low
Event Type
Warning
Cause
The battery pack voltage being monitored by the Battery Backup Unit has
fallen below the warning threshold.
Action
The Battery Backup Unit is presently still able to backup the 3ware RAID
controller, but you should replace the battery pack if the warning continues.