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A wireless mouse does indeed need batteries. It may be that a low battery state is making the mouse perform erratically, owing to the voltage being marginally usable, or else past usability, depending upon the exact degree of grip upon the battery or batteries by the battery holder terminals. Or something similar.
If you have not put new batteries into the wireless mouse for several years since you got it, they will need replacing, period.
Tell me what model you see on the underside of the mouse, please... and I will tell you exactly how to go through the somewhat trying procedure of getting the old batteries out and what batteries to put in to the mouse in question.
(If the mouse has no model #, please describe its rough shape, at least.)