Hot Batteries

[Psycho:Active]

correct me if i'm wrong but you've got the Sony battery wired in parellel with the duracells. The positive of the middle duracell seems to be wired to the positive of the sony when it should be wired to the negative.

EDIT: in fact the sony shouldn't be wired to the far right duracell at all. It should go: far right duracell -ve wired to the circuit negative, middle duracell +ve wired to sony -ve, sony +ve wired to circuit positive

Is there any chance you could scribble a diagram for that?

[Circuitbenders]

like this, so each battery connects to the next in series, positive to negative.
That should give you 4.5v.

[Psycho:Active]

I've soldered that and you've cured the hot batteries, thank you. Getting this device to make noise again seems to be another task which now seems impossible (think I just blew the LED trying to give it more juice by putting another battery in parallel).....
But thanks for everyone's input 

[Tyler1144]

Yeah its in parallel, it doesnt need to be there if its paralell

[Gordonjcp]

You don't really need to connect the batteries in parallel.  It's not a good idea anyway.