IBM 81Y4451 Li-ion Raid Controller Battery For Serveraid M5000.
Specification:
Product Type: Raid Controller Battery
Battery Rechargeable: Yes
Battery Size: Proprietary
Battery Chemistry: Lithium Ion (li-ion)
Maximum Battery Run Time: 48 Hour
Dimensions:
Width: 2.13 In
Depth: 0.63 In
Height: 2.25 In