Aren't there supposed to be two wires connecting to the battery holder

I am trying to repair a Chantilly Singing Bear. The batteries were corroded inside the battery holder, so I cleaned it out with baking soda, but still it doesn't work. Opened it up and noticed on the red wire is attached to the battery holder, and there is a loose black wire just dangling from the circuit board not connected to anything. Isn't there supposed to be both a red and black wire connecting to it? Also, general tips on how to connect the wire back would be appreciated. I am very new to this.

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@rblack connect the black wire (blue arrow) to the tab (red arrow) by soldering it. Use this guide to learn about soldering Cómo soldar y desoldar conexiones

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yes the black wire should be connected

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RBlack estará eternamente agradecido.
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