IBM System x3550 M5 Type 5463 Installation And Service Manual page 148

Figure 40. RAID adapter battery or flash power module cable routing for 2.5-inch hard disk
drive server models.
5. Remove the RAID adapter battery or flash power module from the chassis.
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IBM System x3550 M5 Type 5463: Installation and Service Guide
Steps for removing the RAID adapter battery or flash power module for
2.5-inch hard disk drive server models.
a. Open the retention clip to remove the battery or power module.