15 Ultra vs Redmi K80

Phone 1

Phone 2

Winner

Xiaomi Redmi K80

Lifespan decides this one: the Redmi K80 is supported until Nov 2029 at $8.59 per month of safe use, while the 15 Ultra runs out in Mar 2030 ($30.36/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: 15 Ultra 65 · Redmi K80 79 — methodology

The lifespan decider

When specs are close, support length decides it — this is what each phone costs per month of safe use.

Xiaomi 15 Ultra $1350

Safe to buy$30.36/mo

2025◆ Buy-by Mar 20282030

Xiaomi Redmi K80 $355

Safe to buy$8.59/mo

2024◆ Buy-by Nov 20272029

Category by category

Display

15 Ultra 100Redmi K80 80

The 15 Ultra's screen is the better one — 6.73-inch 2k (1440×3200) ltpo amoled, 1–120hz, up to 3200 nits peak.

Performance

15 Ultra 98Redmi K80 92

The 15 Ultra's Qualcomm Snapdragon 8 Elite (3nm) is simply the faster chip.

Camera

15 Ultra 96Redmi K80 67

The 15 Ultra has the stronger camera system (4 real rear lenses vs 2).

Battery

15 Ultra 88Redmi K80 100

6,550mAh vs 5,410mAh — the Redmi K80 lasts longer between charges.

Software longevity

15 Ultra 53Redmi K80 49

The 15 Ultra is supported until Mar 2030 — 3 months longer than the Redmi K80.

Value

15 Ultra 65Redmi K80 79

Overall value goes to the Redmi K80 at $8.59 per month of safe use.

Full spec table

Spec	15 Ultra	Redmi K80
Price (street)	$1350	$355
Display	6.73-inch 2K (1440×3200) LTPO AMOLED, 1–120Hz, up to 3200 nits peak	6.67-inch AMOLED, 2K, 120Hz, 3200 nits peak
Chipset	Qualcomm Snapdragon 8 Elite (3nm)	Qualcomm Snapdragon 8 Gen 3 (4nm)
RAM	16GB	12GB/16GB
Storage	512GB/1TB	256GB/512GB/1TB
Battery	5,410 mAh	6,550 mAh
Charging	90W wired, 80W wireless	90W wired, 30W wireless
Rear cameras	50MP main, 50MP ultra-wide, 50MP telephoto (70mm floating), 200MP periscope telephoto	50MP main, 8MP ultra-wide, 2MP macro
Dimensions	161.3 × 75.3 × 9.35 mm	160.3 × 75.0 × 8.0 mm
Weight	226 g	206 g
Water resistance	IP68	IP68
Supported until	Mar 2030	Nov 2029

15 Ultra full verdict →Redmi K80 full verdict →Longevity master board →

Scores and verdicts are computed from our verified database — see exactly how. Specs from manufacturer documentation; prices reflect major US retailers.