Batteries

• The HPE 878644-001 is a 96W Smart Storage Battery (also known as a Cache Battery or Supercapacitor Backup Unit) with a 260mm cable, specifically engineered for HPE ProLiant Gen9 servers to provide non-volatile cache protection for RAID controllers during power loss.
• This battery module functions as the backup power source for the write-back cache on HPE Smart Array controllers, preserving in-flight write data in the controller's onboard cache (typically 1GB or 2GB) until power is restored, preventing data corruption in mission-critical storage environments.
• It is typically installed on HPE ProLiant Gen9 servers (e.g., DL360 Gen9, DL380 Gen9, ML350 Gen9) equipped with Smart Array P440ar, P840, P840ar, or similar Gen9 RAID controllers, where it enables safe write-back caching for maximum I/O performance in databases, virtualization, and high-transaction workloads.
• The 878644-001 delivers reliable backup power with supercapacitor technology (maintenance-free, no traditional battery replacement cycles), integrated protection circuitry, and a 260mm cable for flexible routing inside the server chassis, supporting the PERC-style battery learn cycle (periodic charge/discharge for health monitoring).
• Reliability is enhanced by supercapacitor design (longer lifespan than traditional batteries, no hazardous disposal), automatic health monitoring via HPE iLO and Smart Storage Administrator, and seamless integration with Gen9 controller firmware for fault detection and alerts.
• Available in new or refurbished conditions; new units commonly have 2025 manufacture dates (fresh stock with full expected lifespan), while refurbished batteries are widely sold and tested for charge capacity and functionality.
• HPE provides a standard limited warranty on new batteries (typically 1–3 years, aligned with server/controller warranty), with eco-friendly attributes including supercapacitor technology (longer life, no chemical waste) and RoHS compliance.
• As an HPE-branded 878644-001 Smart Storage Battery with 260mm cable, it is a direct, vendor-approved replacement for Gen9 Smart Array controllers, requiring no firmware or configuration changes.