Is the 50-hour battery figure per charge or with the case?

It is total playtime with the charging case, which has an 800 mAh battery. Expect far fewer hours from the buds alone, and a full case charge takes about 3 hours.

Does it have real active noise cancellation?

Yes. Anker lists adaptive active noise cancellation, which adjusts to surrounding noise. At this price, expect it to dull engine and fan noise rather than erase it.

How does it compare with the soundcore P30i or P20i?

The P31i adds adaptive ANC, Spatial Audio and translation over the cheaper P20i, and it is the newer model in the line. Pick it if you want ANC; the P20i is enough for plain listening.

What comes in the box?

The earbuds, the charging case, a charging cable and a user manual.

Is it good for calls?

Anker claims 6-mic AI-enhanced voice pickup. That helps in light noise, but very windy or crowded streets will still bleed into calls.

Is it worth it over pricier ANC earbuds?

It covers the core features — adaptive ANC, Spatial Audio, long total battery and translation — that cost far more elsewhere. You give up premium materials and fast charging, not headline features.