does the power button still click and not register a click, or does it feel stiff? It could either be a bad connection to the motherboard (check the flex cable and connect on the LB - located on the top right under a shield secured by two screws) -maybe it was knocked when the battery was replaced? Otherwise, it could be that the flex cable itself is damaged and need replacing, which is more extensive than a basic battery replacement, but can be done using an iFixit guide and the part itself is under $10 from reputable sellers on eBay, so it’s not that expensive.
I am curious to know if the volume buttons and mute switch work?
Hope this helps (:
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