HP ProLiant DL380 G4 Server - Manual (Page 26)

Component identification 26
Battery-backed write cache LED statuses
NOTE: This feature applies only to SCSI models.
Server status LED status Battery module status
Server is on and has normal run
time Green = On Fast charging
Green = Flashing The microcontroller is waiting for
communication from the host controller.
Green = Off The battery is fully charged.
Amber = On A short exists in the connection of one or
more of the three button cells within the
battery module.
Amber = Flashing An open exists in the circuit between the
positive and negative terminals of the battery
module.
Amber = Off Normal
Server is off and is in data
retention mode Amber = Flashing every
15 seconds User data held in the write cache is being
backed up.