HPE 727258-B21 Smart Storage Battery is a server battery option for DL, ML and SL systems. Its 96W rating and 145mm cable identify this version for the supported server setup.
HPE specifies the battery for use with Smart Array controllers. One battery can serve all Smart Array controllers in a server, making it a shared storage-controller component rather than a separate battery for each controller. HPE also lists it as an option for the ProLiant DL160 Generation 9.