BLU S91 Review: Budget 4G Smartphone with Long Battery Life

BLU S91 (Model: S0690WW)

English Definition

The BLU S91 is a budget 4G Android smartphone released in June 2022 by U.S.-based BLU Products. Targeting value-conscious users needing a reliable daily driver with long battery life and expandable storage, it features a 6.5-inch HD+ IPS LCD display, MediaTek Helio G25 chipset, 5000mAh battery, 13MP triple rear/13MP front cameras, and a 3.5mm headphone jack, designed for basic daily use and dual-SIM scenariosBLU Products.

Core Specifications

Category	Details
Launch & Pricing	Released June 24, 2022; approx. $149-$169 unlocked (US market); variants in Black, Gold, Green
Display	6.5-inch HD+ IPS LCD Infinity Display, 720×1600 (20:9, ~269 ppi); 60Hz refresh rate, water-drop notch, ~81.5% screen-to-body ratioBLU Products
Processor & Memory	MediaTek Helio G25 (MT6762G, 12nm); 4×2.0GHz + 4×1.5GHz Cortex-A53; PowerVR GE8320 GPU; 4GB LPDDR4X RAM; 128GB eMMC 5.1 storage; microSD up to 256GB (hybrid SIM slot)
Cameras	– Rear Triple: 13MP (wide, f/2.0, PDAF, LED flash); 0.3MP (macro, f/2.4); 0.3MP (depth, f/2.4)- Front: 13MP (f/2.0)- Video: 1080p@30fps (rear/front), LED flash, HDR, panorama
Battery	5000mAh non-removable Li-Po; 10W wired USB-C 2.0 charging; up to 2-day endurance (light use)BLU Products
Connectivity	4G LTE (B1/B2/B3/B4/B5/B7/B12/B13/B17/B28/B66), 3G, GSM; Wi‑Fi 4 (802.11 a/b/g/n), Bluetooth 5.1, GPS/GLONASS/BeiDou; 3.5mm headphone jack, USB-C 2.0; FM radio; no 5G, no NFC, no wireless chargingBLU Products
Build & Design	Slate form factor; 164.7×76×8.9 mm; 202g; Plastic back/frame, glass front; no IP rating; side-mounted fingerprint sensor, AI face unlock; Dual Nano-SIM (dual stand-by)BLU Products
Software	Android 11 (stock-like UI, limited OS upgrades); minimal pre-installed apps, no bloatwareBLU Products

Key Features & Market Position

5000mAh Long-Life BatteryThe 5000mAh cell with 10W charging delivers up to 2 days of use for light tasks, reducing charging frequencyBLU Products.
13MP Triple Rear CamerasThe 13MP main sensor with PDAF, macro, and depth sensors covers daily photography and basic portrait needs; LED flash supports low-light shooting.
128GB Expandable Storage128GB internal storage expandable via microSD up to 256GB, meeting basic storage needs for photos, videos, and appsBLU Products.
Dual Security OptionsSide-mounted fingerprint sensor + AI face unlock provides flexible security for daily useBLU Products.
3.5mm Headphone JackRetains a 3.5mm jack for legacy wired headphones, catering to users with existing audio gearBLU Products.

Strengths & Limitations

Strengths

5000mAh battery offers excellent endurance, ideal for users who hate frequent charging.
128GB internal storage + expandable microSD solves low-storage issues for budget devices.
3.5mm jack caters to wired headphone users.
Dual-SIM support suits users needing two phone numbers.

Limitations

No 5G connectivity, less future-proof than 5G competitors.
10W charging is slow; full charge takes ~3.5 hours.
No IP rating, vulnerable to water/dust damage.
Helio G25 handles basic tasks but struggles with heavy apps/gaming.
60Hz display lacks smoothness for fast-paced content; 720p resolution is basic.

Market Role

The BLU S91 fills the niche for budget 4G users prioritizing long battery life and expandable storage, competing with Moto G Pure (2021) and Nokia G11. It is suitable for first-time smartphone users, prepaid plan subscribers, or those needing a secondary dual-SIM device.