The HPE P01363-B21 Storage Device Backup Battery is a low-halogen lithium-ion battery designed as a central backup power source for HPE Smart Array Gen10 and Gen9 performance RAID controllers of the P-class. It ensures data integrity by securing the write cache contents to flash storage during unexpected server power outages, thus preventing data loss. Additionally, this battery serves as a backup power source for HPE NVDIMMs, enabling the transfer of volatile data from DRAM to non-volatile NAND flash storage for safe keeping. Only one unit is required per server, as it supports multiple devices simultaneously, optimizing space and efficiency. Made from durable materials, it provides reliable performance in demanding server environments with a focus on long-term stability and low maintenance. The lithium-ion technology delivers consistent power compared to traditional batteries and extends lifespan, while the low-halogen design supports environmental standards. Ideal for enterprise data centers, this backup battery enhances system availability and data protection without frequent replacements. Its compatibility with specified HPE controllers and NVDIMMs ensures seamless integration into existing infrastructures, making it a practical component for high-availability solutions. Weighing approximately 500 g and featuring a compact form factor, it can be easily installed in standard server racks. This product is essential for maintaining operations and protecting critical data from unexpected power interruptions.