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Chapter 2 Using the Battery Backup Module 9
2 Using the Battery Backup Module
Charging the Battery Pack
The battery pack is shipped uncharged. You must charge the
battery pack before you can use it. The minimum time that the
battery must be charged is:
AMI Part Number Description Time to Charge
BAT-NIMH-4.8-01 Battery, NIMH, 4.8V, 650mA onboard
battery pack with mounting brackets
4 hours
BAT-NIMH-4.8-02 Battery, NIMH, 4.8, 1200mA external
offboard battery pack
Primary - 12 hours (to 100%)
Primary - 6 hours (to 90%)
Secondary - 60 hours
The full data retention time is not available until the battery pack
is fully charged. It is a good idea to set the PowerEdge cache
write policy option to Write-Through during the battery pack
charging period. After the battery pack is fully charged, you can
change the cache write policy to Write-Back.
Removing the Battery Pack
A new battery pack should be installed in the battery backup
module every 3 to 5 years.
Step Action
1 Bring down the operating system properly. Make sure that cache memory has been
flushed. You must perform a system reset if operating under DOS. When the computer
reboots, the PowerEdge controller flushes cache memory.
2 Turn the computer power off.
3 Remove the computer cover.
4 Disconnect the battery pack from the battery backup module. Remove any other items
that you want to remove, such as the battery backup module, PowerEdge controller, or
DRAM modules.
5 Replace the computer cover and turn the computer power on.