I’d assume the issue is the replacement battery since it sounds like it’s requiring power from an external source to power on at all, as far as the alternatives go there’s none that I’m aware of that would be worth fixing but that’s just in my experience.
My recommendation is to reach out to the supplier and attempt to work out some sort of return/replacement of the part and try reinstalling it, additionally it doesn’t hurt to make sure all connectors have a clean connection with no adhesive partially blocking them because that can easily happen during repair and is a quick fix if it’s the issue.
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