i bought a Dell Power Edge PERC 6i PCI-e SAS Raid Controller Card T774H from eBay and my dell power edge detects it but its does not have a battery can i get any  batter or is their a specific type that i have to use.

my dell power edge 2900 also blinks a amber light it turns on and off  i don't know what that means if anyone can tell me that would be nice