400 vs Redmi 15 5G
It depends
Too close to call outright
These two are within 1 point overall — it genuinely depends on price on the day. The 400 edges both longevity and performance, so prefer it when prices are close.
Value Score: 400 76 · 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.
Category by category
The 400's screen is the better one — 6.55-inch amoled, 1.5k, 120hz, 5000 nits peak.
The 400's Qualcomm Snapdragon 7 Gen 3 (4nm) is simply the faster chip.
The 400 has the stronger camera system (2 real rear lenses vs 1).
7,000mAh vs 5,300mAh — the Redmi 15 5G lasts longer between charges.
The 400 is supported until May 2031 — 22 months longer than the Redmi 15 5G.
Pound for pound, these two are equally good deals.
Full spec table
| Spec | 400 | Redmi 15 5G |
|---|---|---|
| Price (street) | $350 | $180 |
| Display | 6.55-inch AMOLED, 1.5K, 120Hz, 5000 nits peak | 6.9-inch IPS LCD, FHD+, 144Hz, 850 nits peak |
| Chipset | Qualcomm Snapdragon 7 Gen 3 (4nm) | Qualcomm Snapdragon 6s Gen 3 |
| RAM | 8GB/12GB | 4GB/6GB/8GB |
| Storage | 256GB/512GB | 128GB/256GB |
| Battery | 5,300 mAh | 7,000 mAh |
| Charging | 66W wired (5300mAh EU model), 5W reverse wired | 33W wired, 18W reverse wired |
| Rear cameras | 200MP main, 12MP ultra-wide | 50MP main, 2MP depth |
| Dimensions | 156.5 × 74.6 × 7.3 mm | 169.5 × 80.5 × 8.4 mm |
| Weight | 184 g | 217 g |
| Water resistance | IP65/IP66 (market dependent) | IP64 |
| Supported until | May 2031 | Aug 2029 |
Scores and verdicts are computed from our verified database — see exactly how. Specs from manufacturer documentation; prices reflect major US retailers.