Redmi 15 5G vs Redmi K70 Ultra

Phone 1

Phone 2

Winner

Xiaomi Redmi 15 5G

Lifespan decides this one: the Redmi 15 5G is supported until Aug 2029 at $4.80 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 15 5G 75 · Redmi K70 Ultra 73 — 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 15 5G $180

Safe to buy$4.80/mo

2025◆ Buy-by Aug 20272029

Xiaomi Redmi K70 Ultra $380

Buy with care$15.17/mo

2024◆ Buy-by Jul 20262028

Category by category

Display

Redmi 15 5G 70Redmi K70 Ultra 80

The Redmi K70 Ultra's screen is the better one — 6.67-inch amoled, 1.5k, 144hz, 4000 nits peak, dolby vision.

Performance

Redmi 15 5G 46Redmi K70 Ultra 95

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

Camera

Redmi 15 5G 55Redmi K70 Ultra 67

The Redmi K70 Ultra has the stronger camera system (2 real rear lenses vs 1).

Battery

Redmi 15 5G 100Redmi K70 Ultra 90

7,000mAh vs 5,500mAh — the Redmi 15 5G lasts longer between charges.

Software longevity

Redmi 15 5G 45Redmi K70 Ultra 30

The Redmi 15 5G is supported until Aug 2029 — 12 months longer than the Redmi K70 Ultra.

Value

Redmi 15 5G 75Redmi K70 Ultra 73

Pound for pound, these two are equally good deals.

Full spec table

Spec	Redmi 15 5G	Redmi K70 Ultra
Price (street)	$180	$380
Display	6.9-inch IPS LCD, FHD+, 144Hz, 850 nits peak	6.67-inch AMOLED, 1.5K, 144Hz, 4000 nits peak, Dolby Vision
Chipset	Qualcomm Snapdragon 6s Gen 3	MediaTek Dimensity 9300+ (4nm)
RAM	4GB/6GB/8GB	12GB/16GB/24GB
Storage	128GB/256GB	256GB/512GB/1TB
Battery	7,000 mAh	5,500 mAh
Charging	33W wired, 18W reverse wired	120W wired
Rear cameras	50MP main, 2MP depth	50MP main, 8MP ultra-wide, 2MP macro
Dimensions	169.5 × 80.5 × 8.4 mm	160.4 × 75.1 × 8.4 mm
Weight	217 g	211 g
Water resistance	IP64	IP68
Supported until	Aug 2029	Jul 2028

Redmi 15 5G full verdict →Redmi K70 Ultra 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.