Why would it be risky? I’m genuinely curious if you have any resources (other than Apple’s, because they’re obviously biased) that show that a third party battery is dangerous.

As far as I know, as long as the battery meets the dimensions, nominal volatage, chemistry/max charge rate/communication to the charging circuitry, discharge rate, it will function safely.

A battery is a battery is a battery. There’s no concievable reason I can think of that would require you use an Apple branded battery. If you have evidence to the contrary I’d love to see it. Knowing proper battery safety is important if you mess with them in any capacity (which I do), so something I may not be aware of is important to know.