The reason for asking 'why' is just in case you were trying to 'fix' any specific issue or if it was just routine maintenance. You always want to start with the BIOS:[URL] Then the BMC/ESM:[URL] Driver:[URL] RAID Firmware:[URL] HDD, DRAC, and NIC firmware could be updated at this point, but these are the primary update you would be looking for to address RAID battery issues. The above driver version is assuming that you are using Server 2000, as that is the only OS that would be using a RAID driver version of 2.08.0.32. Also, keep in mind, that the PERC schedules regular "learning" cycles for the battery, where it completely drains the battery, then recharges it ... during this time, you may see a message in OMSA or on the LCD panel indicating a battery problem and that write cache has been disabled. The RAID controller (firmware) is what is responsible for the battery, so doing these updates can ensure that the battery is being managed to the best of the hardware's ability, provided the battery is still good. If you have any other questions about what you are seeing/experiencing, let us know.  
i got a power edge 2950 i'm trying to find the firmware to update. version 2.08.00.32
I got a Power edge 2950