Dell 58296 Using the Battery Backup Module, Charging the Battery Pack, Removing the Battery Pack

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	4 hours
	battery pack with mounting brackets
BAT-NIMH-4.8-02	Battery, NIMH, 4.8, 1200mA external	Primary - 12 hours (to 100%)
	offboard battery pack	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-Throughduring 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

1Bring 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.

2Turn the computer power off.

3Remove the computer cover.

4Disconnect 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.

5Replace the computer cover and turn the computer power on.

Chapter 2 Using the Battery Backup Module 9