The Mi 12s cannot be charged with a 27w charger.
The Mi 12S Ultra battery capacity is 4800mAh, the original charger is 67W wired fast charge, 0-100 full time is 40 minutes, and supports wireless charging up to 50W. It supports wireless reverse charging and is also compatible with Xiaomi's multiple fast charging protocols, including 67W, 55W, 50W, 40W, 33W, 30W, 27W and 20W. Also supports up to 27W PPS charging, compatibility is very good.
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The Mi 12S Ultra can support 67W wired fast charge, and can also support wireless charging and reverse charging, but does not support 120W fast charge. The Mi 12S Ultra has a 5,000mah battery with a single-cell design, which is similar to most current flagship smartphones and can meet a day of heavy use