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Cisco PIX Firewall Hardware Installation Guide
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Chapter 7 PIX 535
Replacing a Lithium Battery
Note For Stateful Failover on the PIX 535, you must use a Gigabit Ethernet (GE) failover link with
GE interfaces.
Caution Do not turn the power on until the units are connected and the primary unit is configured completely.
Step 6 Power the primary unit on first, then power on the secondary unit. Within a few seconds, the active unit
automatically downloads its configuration to the standby unit.
If the primary unit fails, the secondary unit automatically becomes active.
Replacing a Lithium Battery
The PIX Firewall has a lithium battery on its main circuit board. This battery has an operating life of
about 10 years. When the battery loses its charge, the PIX Firewall cannot function. The lithium battery
is not a field replacable unit (FRU). Contact Cisco TAC to replace the battery.
Note Do not attempt to replace this battery yourself.
Warning
Danger of explosion exists if the lithium battery is incorrectly replaced. Replace only with the same
or equivalent type recommended by the manufacturer. Dispose of used batteries according to the
manufacturer's instructions.
Installing a Memory Upgrade
Observe the following warnings, cautions, and notes when installing additional PIX Firewall system
memory.
The following statement applies to DC models:
Warning
Before performing any of the following procedures, ensure that power is removed from
the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel
board that services the DC circuit, switch the circuit breaker to the OFF position, and
tape the switch handle of the circuit breaker in the OFF position.
The following statement applies to both AC and DC models:
Warning
Before working on a system that has an On/Off switch, turn OFF the power and unplug the
power cord.
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