Redmi A4 5G vs Redmi K70 Ultra

Phone 1

Phone 2

Winner

Xiaomi Redmi A4 5G

Lifespan decides this one: the Redmi A4 5G is supported until Nov 2028 at $3.41 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 A4 5G 70 · 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 A4 5G $100

Buy with care$3.41/mo

2024◆ Buy-by Nov 20262028

Xiaomi Redmi K70 Ultra $380

Buy with care$15.17/mo

2024◆ Buy-by Jul 20262028

Category by category

Display

Redmi A4 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 A4 5G 55Redmi K70 Ultra 95

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

Camera

Redmi A4 5G 55Redmi K70 Ultra 67

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

Battery

Redmi A4 5G 83Redmi K70 Ultra 90

5,500mAh vs 5,160mAh — the Redmi K70 Ultra lasts longer between charges.

Software longevity

Redmi A4 5G 35Redmi K70 Ultra 30

The Redmi A4 5G is supported until Nov 2028 — 4 months longer than the Redmi K70 Ultra.

Value

Redmi A4 5G 70Redmi K70 Ultra 73

Pound for pound, these two are equally good deals.

Full spec table

Spec	Redmi A4 5G	Redmi K70 Ultra
Price (street)	$100	$380
Display	6.88-inch IPS LCD, HD+, 120Hz	6.67-inch AMOLED, 1.5K, 144Hz, 4000 nits peak, Dolby Vision
Chipset	Qualcomm Snapdragon 4s Gen 2 (4nm)	MediaTek Dimensity 9300+ (4nm)
RAM	4GB	12GB/16GB/24GB
Storage	64GB/128GB	256GB/512GB/1TB
Battery	5,160 mAh	5,500 mAh
Charging	18W wired (33W charger in box)	120W wired
Rear cameras	50MP main	50MP main, 8MP ultra-wide, 2MP macro
Dimensions	171.88 × 77.8 × 8.22 mm	160.4 × 75.1 × 8.4 mm
Weight	212 g	211 g
Water resistance	IP52	IP68
Supported until	Nov 2028	Jul 2028

Redmi A4 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.