I've search online for answers but it's hard to separate the wheat from the chaff in cases like this.

 

We've had this Powervault for 3.5 years now and one of the raid controllers (MD36 series-  Reg Model: E02M ) has stopped working with the battery light/LED on in the backpanel. 

Will a non-functioning battery in the raid controller cause the RAID controller to stop functioning?

Is there a more definitive method of determining the underlying cause of this RAID controller going south? 

Obviously the fantasy would be to just change the battery and be back up but I'm starting to fear it would require some configuration if the firmware has been wiped? 

Any insight?