Redmi K70 Ultra vs Redmi Note 15 5G

Phone 1

Phone 2

Winner

Xiaomi Redmi Note 15 5G

Lifespan decides this one: the Redmi Note 15 5G is supported until Dec 2029 at $6.03 per month of safe use, while the Redmi K70 Ultra runs out in Jul 2028 ($15.17/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: Redmi K70 Ultra 73 · Redmi Note 15 5G 71 — methodology

The lifespan decider

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

Xiaomi Redmi K70 Ultra $380

Buy with care$15.17/mo

2024◆ Buy-by Jul 20262028

Xiaomi Redmi Note 15 5G $250

Safe to buy$6.03/mo

2025◆ Buy-by Dec 20272029

Category by category

Display

Redmi K70 Ultra 80Redmi Note 15 5G 80

Both displays are effectively the same class.

Performance

Redmi K70 Ultra 95Redmi Note 15 5G 48

The Redmi K70 Ultra's MediaTek Dimensity 9300+ (4nm) is simply the faster chip.

Camera

Redmi K70 Ultra 67Redmi Note 15 5G 67

Camera systems are comparable on paper — pick by sample photos.

Battery

Redmi K70 Ultra 90Redmi Note 15 5G 90

Battery capacities are close enough not to decide this.

Software longevity

Redmi K70 Ultra 30Redmi Note 15 5G 49

The Redmi Note 15 5G is supported until Dec 2029 — 16 months longer than the Redmi K70 Ultra.

Value

Redmi K70 Ultra 73Redmi Note 15 5G 71

Pound for pound, these two are equally good deals.

Full spec table

Spec	Redmi K70 Ultra	Redmi Note 15 5G
Price (street)	$380	$250
Display	6.67-inch AMOLED, 1.5K, 144Hz, 4000 nits peak, Dolby Vision	6.77-inch AMOLED, FHD+, 120Hz, 3200 nits peak
Chipset	MediaTek Dimensity 9300+ (4nm)	Qualcomm Snapdragon 6 Gen 3
RAM	12GB/16GB/24GB	8GB
Storage	256GB/512GB/1TB	256GB/512GB
Battery	5,500 mAh	5,520 mAh
Charging	120W wired	45W wired
Rear cameras	50MP main, 8MP ultra-wide, 2MP macro	108MP main, 8MP ultra-wide
Dimensions	160.4 × 75.1 × 8.4 mm	164 × 75.4 × 7.4 mm
Weight	211 g	178 g
Water resistance	IP68	IP66
Supported until	Jul 2028	Dec 2029

Redmi K70 Ultra full verdict →Redmi Note 15 5G 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.