Why does my furby turn off a couple seconds after being on?

My friend gifted me her old furby, a 2012 voodoo purple one and once I opened the battery compartment it still had batteries and corrosion was everywhere. I cleaned as much as I could with a q tip and some vinegar and later did it again with alcohol. I put batteries in it and it turned on, spoke but did not react to tingling, petting and it did not move, it only talked for a bit before shutting down again and turning back on. I've searched everywhere to see what I can do but I cannot find this problem anywhere else. I opened the furby up, what should I do now?