IBM System Storage Subsystem DS5020 - Manual (Page 174)

v Yes - Select the Recovery Guru toolbar button in the Subsystem
Management window and complete the recovery procedure. If a problem is
still indicated, contact IBM Customer and Technical Support.
v No - Go to step 20.
20. Create, save, and print a new storage subsystem profile.
Replacing a battery unit
Statement 2:
CAUTION:
When replacing the lithium battery, use only an equivalent type battery
recommended by the manufacturer. If your system has a module containing a
lithium battery, replace it only with the same module type made by the same
manufacturer. The battery contains lithium and can explode if not properly
used, handled, or disposed of.
Do not:
v Throw or immerse into water
v Heat to more than 100° C (212° F)
v Repair or disassemble
Dispose of the battery as required by local ordinances or regulations.
Each RAID controller in the DS5020 storage subsystem contains a rechargeable
battery unit that backs up data in cache to flash memory in the event of power
failure.
Use the following procedure if the DS Storage Manager client instructs you to
replace the battery unit because the current battery has failed. You can also use the
DS Storage Manager client to check the status of the battery. Because
write-caching is disabled when either one of the battery units fail, replace the failed
battery unit as soon as possible to minimize any impact due to the disabling of the
write-caching function.
Replace only the battery unit that is indicated as failed by the LEDs. You do not
need to replace both battery units when the Battery LEDs indicate that only one
battery unit has failed. If the battery is identified as failed by the DS Storage
Manager and the battery LEDs were are lit in a fault state, use the Service Action
Allowed menu function in the DS Storage Manager subsystem window to identify
the failed battery for replacement.
Important: Unlike the batteries for DS4000 storage subsystems, the DS5020
storage subsystem battery units do not have set expiration dates. Do
not replace these batteries after a certain usage period.
Attention: When you handle static-sensitive devices, take precautions to avoid
damage from static electricity. For details about handling static-sensitive devices,
see “Handling static-sensitive devices” on page 29.
Use the following procedure to replace a battery unit.
144 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide