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Why do you want to replace the battery ? What is the reason that leads you to think that the battery needs to be replaced ?
I just want to make sure that the battery really needs to be replaced.
You have array 2540 or 2540 M2 ?
Battery replacement procedure for 2540 require place corresponded controller to offline state.
It is first important to know why the battery needs to be replaced, because all the 2500/2500-M2 have SMART batteries and if the battery is only expired, it should not be replaced.
There are different situations for which the batteries do not need to be replaced, they are explained in our KB article "Troubleshooting Sun Storage[TM] Array SMART Battery Faults (Doc ID 1021054.1)".