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Dell U8735 / NU209 PERC 5i / 6i RAID Battery for PowerEdge 1950 / 2900 / 2950 ST600MM0088 the rotor-lock signal allows theThe Dell U8735 (alt: NU209) is a RAID controller battery for Dell PERC 5i and 6i controllers, providing cache backup power to preserve write cache data during power interruptions in Dell PowerEdge 1950, 2900, and 2950 servers. Replacing a degraded battery restores full write cache performance and data protection. Part Number: U8735 (alt: NU209) Type: RAID Battery (Cache Backup Unit) Compatible With: Dell PERC 5i, PERC 6i controllers Server