HSTNM-B011 - HP HSTNM-B011 48V 5000MAH NI-MH BATTERY FOR SMART ARRAY P400 AND P800 SAS CONTROLLER BOARDS WITH BATTERY BACKED WRITE CACHE (BBWC) - serverevolution.com
HP 398648-001 - 4.8V Ni-MH Raid Controller Battery Pack for HP P800, P400, E500
Amazon.com: HP 381573-001 TDSourcing - RAID controller battery backup unit - for HPE Smart Array P400, P400/256MB, P400/512MB, P800 : Electronics
HP 405831-001 Smart Array P400 PCI-Express SAS RAID Controller w/256MB Cache & BBU. Low Profile. Connectors on Back.@ SCSI4ME.COM
013159-001 | HP Smart Array P400 PCI-Express 8-Channel Serial Attached SCSI (SAS) RAID Controller Card with 256MB BBWC (Battery Backed Write Cache)