Cisco Firepower 3500 Appendix

Replacing a RAID Battery Backup Unit
Assembly on the Firepower Management
Center 3500
Use these instructions to replace the RAID battery backup unit (BBU) assembly on Firepower
Management Center 3500. You should power down the device before you replace the BBU assembly
during a maintenance window. See the following sections for more information:
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BBU Overview
The Firepower Management Center 3500 contains a battery backup unit (BBU) that protects the integrity
of cached data on the RAID controllers by providing backup power if there is a complete loss of AC
power or a brief power interruption. Cisco recommends that you replace this BBU once a year.
A new BBU replacement assembly is available from Cisco. The assembly includes a new BBU model
(BBU8) with a five year lifespan and a new plastic battery tray. The BBU is held in place in the plastic
battery tray (see in
remove the installed BBU and tray and replace them with the new BBU assembly.

Working in an ESD Environment

Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. ESD damage occurs
when electronic components are improperly handled and can result in complete or intermittent failures.
Always follow ESD-prevention procedures when you remove and replace components. Ensure that the
chassis is electrically connected to earth ground. Wear an ESD-preventive wrist strap, ensuring that it
makes good skin contact. Connect the grounding clip to an unpainted surface of the chassis frame to
BBU Overview, page A-1
Working in an ESD Environment, page A-1
Safety Warnings, page A-2
Preparing to Replace the BBU, page A-2
BBU Replacement Instructions, page A-4
Monitoring the BBU, page A-10
Figure A-1) that securely locks into the base of the Firepower MC3500 chassis. You
Cisco Firepower Management Center 750, 1500, 2000, 3500, and 4000 Hardware Installation Guide
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A-1