HP NetRAID 2M Battery Replacement Installation

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Battery Specifications
Charge Time for Battery Packs
The Backup Battery is shipped from the factory in a precharged state. It takes
approximately six hours to charge the battery after it is first installed.
Battery Life
The HP NetRAID-2M software warns you when the battery needs to be replaced.
Under normal usage, the battery should last twice the warranty period of the
HP NetRAID-2M adapter. A new battery pack should be installed every 1 to 5
years.
Retention Time for Cache Memory
The Battery Backup Unit can preserve data in the HP NetRAID-2M DRAM for
approximately 72 hours for the 64-MB cache and approximately 48 hours for the
128-MB cache. The retention time for cache memory varies with the number of
DIMMs installed, the number of chips on the installed DIMMs, the SDRAM
memory size, and the SDRAM manufacturer. The bigger size of DIMMs the
adapter has, the faster the battery drains.