Stray threads / wires?

I dug up my old bricked pair of BeatsX buds and though I’d give a stab at replacing them. I’ve been following along to this video. I had some trouble getting the cover to slide off, so some pliers were involved. I successfully desoldered / removed the original battery, but there are some stray threads or possibly wires showing at the end of the connector.

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did I break something? I’d like to know before I buy a new battery. Thanks!

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