The Oppo Find X3 is set to land in March, but ahead of that we’re already learning things about it, with a listing on the FCC (Federal Communications Commission) all but confirming the battery specs of the phone.

The listing (spotted by leaker Abhishek Yadav) is for the Oppo ‘CPH2173’ – a model number that has previously been linked to either the Oppo Find X3 or Oppo Find X3 Pro, so we don’t know for sure which one we’re looking at here, but the specs match leaks about the Pro model.

In any case, the FCC listing mentions a battery with a 2,200mAh rated capacity and a 2,250mAh typical capacity, which is small, but almost certainly means the phone has a dual-cell battery with a total capacity that’s double that, so 4,400mAh or 4,500mAh.
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https://www.techradar.com/news/oppo-find-x3-pro-fcc-listing-reveals-the-battery-size-and-charging-speeds