Hello,
It sounds as if you are replacing the cache battery on the Smart Array card connected to the P2000 array. It has been my experience that you need to be sure the cache battery is new and has not been sitting on a shelf for some time. If the battery has discharged before being installed into the Smart Array you might experience different or unexpected results.
As mentioned previously, if needed you should gather logs from the host (ADU/AHS) and log a case with your product number.
Cheers,
Shawn