Please help array hp proliant ml 350

[jredondo1]

Hi, I currently had a hp proliant ml350 g6 and has 1 raid 1 with 2 disk of 500 gb the array is 500 gb.
We bought 2 sas of 900 gb we have been replacing the discs first the damaged one and when it is rebuilt we have replaced the second one.
Well now we have the 500 gb array but with 2 900 gb disks tell me that I have unassigned 44%
The controller is a p410i is there possibility to expand and approve the entire size?
I have the memory and HP battery for the controller

Smart array tells me that the battery is exhausted and that it is changed.
I think it has disabled the expansion and migration and acceleration ....
To change it will activate the expansion ???