IBM System Storage Subsystem DS5020 - Manual (Page 175)

1. Use the DS Storage Manager client software to print a storage subsystem
profile.
2. Locate the RAID controller that contains the failed battery unit.
3. Check the LEDs on the battery units to determine which of the two battery units
has failed. (See “Battery unit LEDs” on page 103.) Replace only the battery unit
that is indicated as failed by the LEDs.
4. Put on antistatic protection.
5. To remove the failed battery unit from the RAID controller, press the orange
battery unit latch toward the black battery handle to unlatch the battery from the
DS5020 chassis and slowly pull the battery unit from the controller chassis
using the handle, as shown in Figure 84.
Pull handle
Latch
Controller A
backup battery unit
Controller B
backup battery unit
Figure 84. Removing and replacing a battery unit from the controller chassis
Chapter 5. Replacing components 145