Redmi K90 Ultra will be equipped with an 8,550mAh Xiaomi Jinshajiang battery, featuring 16 percent silicon content, the Xiaomi sub-brand announced on Thursday. The upcoming smartphone will also arrive with support for 100W wired fast charging and 22.5W wired reverse charging. This is a significant upgrade over the Redmi K80 Ultra, which is backed by a 7,410mAh battery. Moreover, the phone will sport a flat display with M10 luminescent material, offering up to a 165Hz refresh rate, up to 3,500 nits peak brightness, and Xiaomi Qingshan Eye Protection.