5Volts 3A is the limit, you can’t go over this, so don’t bother with the Google pixel chargers etc you’ll just waste cash for nothing. Instead I suggest a thicker gauge USB cable and shorter too, this way you don’t loose current via the cable. Also a quality BRAND name charger, the Chuwi one is average and gets hot. I don’t trust it! I charge my Hi12 with a Tronsmart official Qualcomm quick charge 3 charger that does 5 volts 3A, also other voltages for my mobile. It works well.
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Tablets: Hi12 dual boot & MediaPad M5
Phone: Xiaomi Redmi Note 5 (Global ROM)
PC: Dell G3 15 1050 Ti undervolted & repaste
Desktop PC: AMD Ryzen 1700, 16GB RAM, 512GB 960 Evo, Gigabyte 1060 6GB