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You sure you didnt short out the PSU?
You need a multimeter. Cut the tip off and do a DC voltage check on the bare wires. If it displays a negative voltage (-7.2v) then the polarity is incorrect (relative to the multimeter probe's polarity).
The battery casing has the polarity marked so just solder the wires into their respective plates. Insulate the wires inside the coupler to prevent a short.
Once its put back together do another DC voltage check on the battery plates before you put it in the camera.
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