The HPE 587225-001 is a factory sealed FBWC (Flash Backed Write Cache) Capacitor Module designed for use with HPE ProLiant servers and compatible storage controllers. This module provides backup power to the write cache memory in the event of a power failure, ensuring data is not lost and can be safely written to disk.
This capacitor module is compatible with the following HPE controllers:

Smart Array P410i/512MB FBWC 2-ports Int SAS Controller
Smart Array P411/1G FBWC 2-ports Ext SAS Controller
Smart Array P212/256MB Controller
Smart Array P410/256MB Controller
Smart Array P410/512MB BBWC Controller
Smart Array P411/256MB Controller
Smart Array P411/512MB BBWC Controller
Smart Array P711m/1G Controller
Smart Array P812/1GB FBWC Controller

It provides a reliable solution for businesses that require uninterrupted data access and protection, ensuring data is not lost during power outages or other unexpected events.