Oppo F31 5G Review: Massive Battery, Rugged Design, Worth the Hype?

Ever had your smartphone die before lunchtime? Or felt your heart drop the moment it slipped from your hand? We’ve all been there. And that’s exactly the kind of everyday stress OPPO is trying to fix with its newest entry in the mid-range lineup — the Oppo F31 5G.

The F-series has always stood for style and fast charging, but this year OPPO is pushing things in a whole new direction. Launched in September 2025 with the bold tagline “The Durable Champion,” the F31 5G mixes rugged build quality with serious battery power. Think a huge 7,000mAh battery, 80W SUPERVOOC fast charging, and a rare IP69 + IP68 + IP66 triple-layer water and dust resistance — all starting at just ₹22,999.

It’s built for value-focused buyers, casual and mobile gamers, and anyone who spends long hours outdoors or away from a charger. Yet, it doesn’t skip the essentials either. You still get a smooth 120Hz AMOLED display, a clean design, and a reliable 50MP main camera.

Quick Take: The Oppo F31 5G aims to rewrite what you should expect from a mid-range phone—especially in battery life and durability. But here’s the real question: does the big focus on toughness come at the cost of performance or camera quality? Let’s dig in and find out.

The Oppo F31 5G is OPPO’s way of asking the mid-range market a bold question: “Why can’t a battery beast also be a durability champ?” With this model, OPPO tries to blend near-flagship toughness and all-day endurance with a smooth, modern user experience. It’s fast, surprisingly rugged, and clearly designed for people who drop their phone more often than they’d like to admit—without giving up on looks.

The Oppo F31 5G brings flagship-like endurance and durability to a price bracket where you rarely see both.

Unboxing: First Impressions Count

OPPO sticks to its familiar packaging style with the Oppo F31 5G, offering a clean white-and-mint box that looks premium without trying too hard. Right on the lid, the brand highlights the two big features you’re paying for: 5G support and 80W SUPERVOOC fast charging.

And unlike many brands that have started trimming down accessories, OPPO remains surprisingly generous. It’s a small thing, but it genuinely improves the out-of-box experience.

Inside the box, you get:

In-Hand Feel

Pick up the F31 5G and two things hit you right away: it’s lighter and sleeker than you’d expect from a phone carrying a huge 7,000mAh battery. At 8mm thick and 185g, it feels surprisingly manageable.

The build is confidence-boosting too. The 360° Armour Body and aerospace-grade aluminum alloy frame give it a solid, reassuring feel. We tried the Bloom Red variant, and the matte, petal-inspired finish looks striking while keeping fingerprints at bay. The camera module sits almost flush, adding to the clean, modern look.

The first impression? A lifestyle phone on the outside—built like a tough companion on the inside.

Key Specs of Oppo F31 5G (At a Glance)

Design & Build

The Oppo F31 5G nails that sweet spot between premium looks and everyday practicality. Even with its huge 7,000mAh battery, the phone stays impressively slim at 8.0mm and light at 185g. It feels sleeker than almost any other big-battery phone in this price range.

A lot of that comes down to OPPO’s thoughtful design choices:

Overall, it’s a mid-range phone that looks and feels far more premium than its price would suggest.

The Durability Champion: IP69 / IP68 / IP66

This is where the F31 5G truly pulls ahead of the competition. OPPO’s 360° Armour Body isn’t just branding—it delivers real, certified toughness with a rare triple protection rating:

In simple terms, this phone is built to survive: rainstorms, accidental drops in water, dusty environments, and everyday bumps. For users who push their phones hard—travelers, field workers, outdoor enthusiasts, or anyone who is just rough on their devices—the Oppo F31 5G sets a new durability benchmark in the value segment.

Display

The Oppo F31 5G delivers a surprisingly premium visual experience thanks to its vibrant 6.57-inch AMOLED display. In a mid-range space where LCDs still dominate, this panel immediately feels like an upgrade — bright, colorful, and sharp enough to elevate everything from streaming to everyday scrolling.

Clarity and Color

The Full HD+ resolution (2372 × 1080) produces a crisp 397 PPI, so text looks razor-sharp and photos stay detailed. OPPO’s AMOLED panel also supports 1.07 billion colors (10-bit), giving you:

Simply put: it’s one of the better displays you’ll find at this price.

The Smooth Factor: 120Hz Adaptive Refresh Rate

Smoothness isn’t a luxury anymore, and the F31 5G embraces that with its 120Hz adaptive refresh rate. The screen adjusts itself based on what you’re doing:

Combine this with a 240Hz touch sampling rate, and the phone feels quick, responsive, and well-tuned for casual gaming.

Brightness and Outdoor Visibility

Where durability-focused phones sometimes fall short, the F31 5G shines — literally.

Even under direct sunlight, the display stays readable for maps, messages, and outdoor use. It may not match ultra-flagships, but it’s more than bright enough for daily life.

To round it off, the screen is protected by AGC DT-Star D+ glass, adding scratch resistance that fits nicely with the phone’s rugged ambitions.

Performance

The Oppo F31 5G runs on the MediaTek Dimensity 6300 5G chipset, a 6nm processor built for efficiency and everyday speed. It isn’t trying to compete with flagship chips—nor does it need to. Instead, OPPO has tuned it for stable, responsive performance that pairs perfectly with the phone’s massive 7,000mAh battery.

Daily Use and Multitasking

With 8GB LPDDR4X RAM and UFS 2.2 storage, the phone handles everyday tasks effortlessly:

This combination prioritizes consistency and reliability, which is exactly what most users want.

Gaming and Benchmarks

For casual and moderate gamers, the F31 5G performs better than expected for its segment.

In benchmarks, the Dimensity 6300 scores around 480,000 on AnTuTu, putting it in line with alternatives like the Snapdragon 695. It’s not built for hardcore gamers, but for most users, it’s a solid all-rounder.

Thermal Management

The 6nm process and the phone’s larger internal structure work together to keep temperatures in check. During extended gaming sessions, the F31 5G:

For a phone designed around endurance, this stable thermal profile is a major plus.

Cameras

Photography on the Oppo F31 5G is centered around a streamlined dual-camera setup, prioritizing the performance of the main sensor over an array of less-useful secondary lenses. This choice aligns with the phone’s focus on practicality and core functionality.

Rear Camera System

The F31 5G features a straightforward dual-camera island:

It’s simple, purposeful, and built around the strengths of the main sensor.

Daylight Performance

The 50MP primary camera delivers exactly what most users want: sharp, vibrant photos in good lighting.

In daylight, this sensor is easily one of the more reliable performers in its class.

Low-Light and Portraits

Low-light results are respectable for the segment. AI Night Mode combines multiple frames to:

While it won’t challenge flagship night shooters, the output is more than usable and social-media-ready.

For portraits, the 2MP depth sensor helps create accurate subject separation. The resulting bokeh looks soft and pleasing, adding depth without unnatural cutouts.

Front Camera

Selfies are handled by a 16MP wide-angle front camera (f/2.4). OPPO’s selfie processing continues to be a strength:

It’s a consistent performer and better than what many competitors offer at this price.

Video Capabilities

The main rear camera records up to 1080p at 60fps. While the lack of 4K may disappoint some users, the 1080p footage is:

A standout feature is Underwater Camera Mode, which works hand-in-hand with the phone’s IP69/IP68/IP66 durability. It lets you capture photos and videos even while the phone is fully submerged — a fun, practical addition for outdoor users.

Overall, the Oppo F31 5G offers very good everyday photography, anchored by a strong main sensor and reliable selfie performance. It’s not aiming to be a camera flagship, but for its price, it delivers consistent results where it matters most.

Battery & Charging

If there’s one feature that truly defines the Oppo F31 5G, it’s the battery. OPPO didn’t just go big here—they went enormous. The phone packs a 7,000mAh cell, and when you pair that with the efficient 6nm Dimensity 6300 chipset, you get the kind of endurance most mid-range phones can’t dream of.

The Power of 7,000mAh

In everyday use, the F31 5G performs exactly the way you’d expect from a battery this size—and then some.

Simply put, it’s a phone built for people who really use their phones.

80W SUPERVOOC: Big Battery, Fast Charging

A battery this large usually comes with one big drawback: long charging times. But OPPO solves that with its 80W SUPERVOOC Flash Charge, included right in the box.

Here’s what you can expect:

That means a quick charge during lunch is enough to carry you through the rest of the day.

The phone also supports Reverse Wired Charging, letting you top up accessories or even another phone—essentially turning the F31 5G into a backup power bank when needed.

The Oppo F31 5G sets a new benchmark for battery life in its segment. You get true multi-day endurance and flagship-level charging speeds in one package—a rare combination at this price.

Software & User Experience

The Oppo F31 5G ships with ColorOS 15 on top of Android 15, and this is easily one of OPPO’s most polished software experiences yet. It feels fast, flexible, and thoughtfully designed, giving you plenty of customization without overwhelming you.

Fluidity and Everyday Performance

ColorOS 15 feels noticeably smoother this year, thanks to two core optimization engines working behind the scenes:

The interface follows OPPO’s “Boundless Design” approach—light, modern, and highly customizable. You can tweak icons, rearrange layouts, and make the phone feel uniquely yours.

The AI Advantage

AI plays a bigger role in ColorOS 15, combining Google’s tools with OPPO’s own features to boost productivity:

These features don’t feel gimmicky—they actually shave off time from everyday tasks.

The Bloatware Trade-Off

Like many mid-range phones, the F31 5G comes with a fair amount of pre-installed apps. The good news is that most can be removed or disabled. It’s a minor annoyance, but once cleared out, the software experience feels clean and focused.

Update Commitment

OPPO’s update promise for the F-series remains solid:

That’s enough to keep the phone secure and usable for years, which matters especially for buyers prioritizing longevity.

Connectivity & Extras

The Oppo F31 5G checks all the right boxes when it comes to staying connected. It also throws in a few thoughtful extras that make everyday use a little smoother.

Connectivity

Audio & Extras

OPPO adds a few welcome touches that improve the overall experience:

Pros & Cons

The Oppo F31 5G sets out to be the durability king of the mid-range—and for the most part, it absolutely delivers. Here’s a quick look at where it shines and where OPPO had to compromise to keep the price in check.

The TechyGenie Verdict

The Oppo F31 5G doesn’t try to win the mid-range race with benchmark numbers or camera count. Instead, it steps into the spotlight as the Durability Champion—a phone built to remove two of the biggest everyday worries: running out of battery and accidentally breaking your device.

The Value Proposition

With a starting price of ₹22,999, the F31 5G delivers a mix of features you simply don’t find together at this budget:

Who Should Buy It?

The Oppo F31 5G is an ideal fit for:

If your priority is battery life + durability + practicality, and you don’t need class-leading performance or a fully loaded camera system, this phone makes an incredibly compelling case.

Final Assessment

Sure, the Dimensity 6300 chipset isn’t built for power users, and the absence of an ultra-wide camera limits versatility. But those trade-offs feel reasonable when you consider what the phone does exceptionally well.

At the end of the day, the Oppo F31 5G delivers something rare in the mid-range market: peace of mind. It’s one of the most reliable, toughest, and longest-lasting phones you can buy right now—highly recommended for anyone who values endurance and durability above all else.