Because the 12sultra is 67w Xiaomi surging second charge, and the Xiaomi 12sPro supports 120w fast charge.
The Mi 12sultra uses a large-capacity battery design of up to 4860mAh, which supports 67W Xiaomi Surging second charge, 50W wireless second charge and 10W reverse charge, as well as a built-in charge management chip.
Even if the charging speed is not as fast as the Xiaomi 12S Pro, the daily use time will be longer, and the control in power consumption will be more powerful, which is a huge advantage.