A prolific leaker claims to have found a new TUV Rheinland Japan approval for a new battery made by the smartphone brand Realme. It has dual 2250mAh cells, and may charge at up to 65 watts (W). This new power-pack may thus be destined for an as-yet unlaunched premium phone: the X3 Pro, perhaps?
https://www.notebookcheck.net/Realme-reportedly-certifies-a-new-dual-cell-battery-that-could-fit-in-an-X3-series-phone.469434.0.html