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3ware BBU-MODULE-03 Battery Backup Unit for 3ware RAID Controllers 1800Ma lithium ION 4.2v
LSI battery backup units are add-on modules that protect against data loss in the event of a server or power failure by providing emergency power to the cache memory. When power is restored, the data not yet written to the hard drives can be retrieved from cache memory.
LSI battery part number: 190-3010-01