Discussion about the Korg PolySix synthesizer

Hello everyone when your battery go's what is the first thing that 
happens I have alot of corosion on the board that the battery is on 
and when I play my polysix the verify will not turn of and I cant get 
the keyboard to respond only one key made sounds and I cant even 
control that one it just go's through the arggegeator all the knobs 
work the filters and stuff the board dont look to good the battery is 
leaking Im going to replace it the copper on the board also 
urrrrggggg I hope that is all thats wrong If any one has went through 
this please help thanks......