PhoneLifespan

15T vs Redmi 15 5G

vs

Winner

Xiaomi Redmi 15 5G

Lifespan decides this one: the Redmi 15 5G is supported until Aug 2029 at $4.81 per month of safe use, while the 15T runs out in Sep 2030 ($9.76/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: 15T 70 · Redmi 15 5G 75 — 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 15 5G $180
Safe to buy$4.81/mo
2025◆ Buy-by Aug 20272029

Category by category

Display
15T 70Redmi 15 5G 70

Both displays are effectively the same class.

Performance
15T 78Redmi 15 5G 46

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

Camera
15T 79Redmi 15 5G 55

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

Battery
15T 90Redmi 15 5G 100

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

Software longevity
15T 61Redmi 15 5G 45

The 15T is supported until Sep 2030 — 14 months longer than the Redmi 15 5G.

Value
15T 70Redmi 15 5G 75

Overall value goes to the Redmi 15 5G at $4.81 per month of safe use.

Full spec table
Spec15TRedmi 15 5G
Price (street)$500$180
Display6.83-inch AMOLED, 2772x1280, 144Hz6.9-inch IPS LCD, FHD+, 144Hz, 850 nits peak
ChipsetMediaTek Dimensity 8400-UltraQualcomm Snapdragon 6s Gen 3
RAM12GB4GB/6GB/8GB
Storage256GB/512GB128GB/256GB
Battery5,500 mAh7,000 mAh
Charging67W wired33W wired, 18W reverse wired
Rear cameras50MP main, 50MP telephoto 2x, 12MP ultra-wide50MP main, 2MP depth
Dimensions163.2 × 78.0 × 7.5 mm169.5 × 80.5 × 8.4 mm
Weight194 g217 g
Water resistanceIP68IP64
Supported untilSep 2030Aug 2029
15T full verdict →Redmi 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.