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