Xiaomi Redmi K90 Ultra Rumored with 8,500 mAh Battery and Built-In Cooling Fan: What We Know

Xiaomi's Redmi sub-brand appears poised to push smartphone performance boundaries with its rumored K90 Ultra (also called K90 Extreme Edition), according to multiple leaks from reliable sources. This device could introduce two firsts for mainstream flagships: active cooling via built-in fan technology and a massive 8,500 mAh battery capacity.

Key Upgrades Over Previous Models

Three major improvements distinguish the K90 Ultra from its K90 and K90 Pro Max siblings:

1. Thermal System Revolution:

   • First Redmi device with integrated cooling fan
   • Expected to sustain peak performance longer than passive cooling solutions
   • Similar approach to gaming phones like ASUS ROG Phone 8, but in mainstream flagship form

2. Battery Capacity Leap:

   • 8,500 mAh capacity (15% larger than K90 Pro Max's 7,400 mAh)
   • Maintains 100W wired charging speeds
   • Potential for multi-day usage between charges

3. Next-Gen Chipset:

   • Custom-tuned Dimensity 9500+ variant
   • Benchmarks suggest 20% faster CPU performance than standard Dimensity 9500
   • Special optimization for thermal management

Competitive Landscape

When compared to current market alternatives:

Feature	Redmi K90 Ultra (Rumored)	Xiaomi 15T Pro	ASUS ROG Phone 8
Battery Capacity	8,500 mAh	7,400 mAh	6,500 mAh
Charging Speed	100W wired	120W wired	65W wired
Cooling System	Active fan	Vapor chamber	AeroActive Cooler 8
Expected Price	$799-$899	$829 (current)	$1,099

Who Needs This Device?

This smartphone targets three specific user profiles:

1. Mobile Power Users:

   • Those who frequently run resource-intensive apps
   • Professionals using CAD/3D modeling tools on mobile
   • Live streamers needing sustained performance

2. Battery-Life Focused Buyers:

   • Travelers without regular charging access
   • Emergency responders needing reliable uptime
   • Field researchers in remote locations

3. Performance Enthusiasts:

   • Users who keep devices 3+ years
   • Early adopters wanting cutting-edge tech
   • Mobile gamers rejecting dedicated gaming phones

Availability Expectations

While official launch details remain unconfirmed, historical Redmi release patterns suggest:

• China-exclusive initial launch
• Global rebranding as Xiaomi 16T Pro likely
• Q3 2026 release window probable
• $799-$899 price range expected

This leak comes from multiple trusted sources including Digital Chat Station and PaperKing13. As always with unannounced devices, final specifications may differ from these early reports.