PhoneLifespan

15T vs Redmi A4 5G

vs

Winner

Xiaomi 15T

Lifespan decides this one: the 15T is supported until Sep 2030 at $9.76 per month of safe use, while the Redmi A4 5G runs out in Nov 2028 ($3.41/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: 15T 70 · Redmi A4 5G 70 — methodology

The lifespan decider

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

Xiaomi 15T $500
Safe to buy$9.76/mo
2025◆ Buy-by Sep 20282030
Xiaomi Redmi A4 5G $100
Buy with care$3.41/mo
2024◆ Buy-by Nov 20262028

Category by category

Display
15T 70Redmi A4 5G 70

Both displays are effectively the same class.

Performance
15T 78Redmi A4 5G 55

The 15T's MediaTek Dimensity 8400-Ultra is simply the faster chip.

Camera
15T 79Redmi A4 5G 55

The 15T has the stronger camera system (3 real rear lenses vs 1).

Battery
15T 90Redmi A4 5G 83

5,500mAh vs 5,160mAh — the 15T lasts longer between charges.

Software longevity
15T 61Redmi A4 5G 35

The 15T is supported until Sep 2030 — 22 months longer than the Redmi A4 5G.

Value
15T 70Redmi A4 5G 70

Pound for pound, these two are equally good deals.

Full spec table
Spec15TRedmi A4 5G
Price (street)$500$100
Display6.83-inch AMOLED, 2772x1280, 144Hz6.88-inch IPS LCD, HD+, 120Hz
ChipsetMediaTek Dimensity 8400-UltraQualcomm Snapdragon 4s Gen 2 (4nm)
RAM12GB4GB
Storage256GB/512GB64GB/128GB
Battery5,500 mAh5,160 mAh
Charging67W wired18W wired (33W charger in box)
Rear cameras50MP main, 50MP telephoto 2x, 12MP ultra-wide50MP main
Dimensions163.2 × 78.0 × 7.5 mm171.88 × 77.8 × 8.22 mm
Weight194 g212 g
Water resistanceIP68IP52
Supported untilSep 2030Nov 2028
15T full verdict →Redmi A4 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.