The Lenovo 67Y2640 is a ThinkServer RAID Controller Battery Backup Unit. It is designed for ThinkServer RD230 and RD240 models. This unit provides consistent power to the RAID controller.
Technical Specifications
RAID controller battery backup unit for Lenovo ThinkServers
Compact dimensions: 0.6 in (W) x 2.6 in (D) x 2.1 in (H)