815983-001 Super Capacitor Cache Battery for HP HPE DL380 & ML350 Servers
Where does the battery cache go – HP Prolient DL380 G8 – Ryan Mangan's IT Blog
512MB battery backed write cache (BBWC) memory module (Does not include the controller board or battery) - HP Proliant DL380 (G5) - 405835-001 - Tekeurope