F115 Ultra Review

The F115 Ultra is not trying to be a sleek everyday flagship. At 710 g, over 30 mm thick, and packing a huge 20,000 mAh battery, this is a specialist phone for people who care more about endurance, field use, and utility than pocket comfort. At around €363, it sits in the rugged/battery-monster category rather than the mainstream midrange market.

Its biggest promise is simple: stay powered for a very long time. But that comes with serious compromises in size, weight, charging speed, and likely camera flexibility.

1. Specifications Overview

2. Strengths & Weaknesses

Strengths

• Exceptional battery capacity

  • The 20,000 mAh battery is the F115 Ultra’s defining feature. For users who spend long days away from outlets — drivers, hikers, field workers, campers, emergency-prep users — this is far more useful than having a thinner body.
  • It also makes reverse charging genuinely meaningful. This phone can plausibly serve as a backup power bank for earbuds, another phone, or small accessories.

• Strong midrange performance for the price

  • The Dimensity 7100, 12 GB of LPDDR5 RAM, and UFS 2.2 storage suggest a phone that should feel responsive in daily use.
  • This is not an underpowered rugged phone with a giant battery slapped on. Apps, navigation, messaging, streaming, and multitasking should be comfortably handled.

• Large, smooth 120 Hz display

  • The 6.78-inch screen is practical for maps, documents, videos, and work dashboards.
  • 120 Hz makes scrolling feel more fluid, which is especially noticeable in long feeds, browser pages, and Android navigation.

• Useful field-friendly extras

  • NFC, wide satellite navigation support, stereo speakers, headphone jack, barometer, compass, gyro, and side fingerprint sensor all make sense on a utility-focused device.
  • The thermal sensor could be genuinely useful for inspection tasks, troubleshooting, or outdoor work, though the actual implementation needs testing.

• Generous memory and storage

  • 12 GB RAM and 256 GB storage are strong at around €363.
  • microSD support adds flexibility for offline maps, videos, job-site photos, or large files.

Weaknesses and Compromises

• It is enormous and very heavy

  • 710 g is not a minor inconvenience. This is the biggest trade-off of the phone.
  • If you mostly text, browse social media, take calls, and carry your phone in a pocket all day, the F115 Ultra may become annoying quickly.

• Charging speed is modest for the battery size

  • 33 W sounds fine until you remember the battery is 20,000 mAh.
  • A full recharge will likely be a long process. This is a device you plan around: charge overnight or before a trip.

• Display brightness looks ordinary

  • 480 nits typical brightness is not impressive for outdoor use.
  • That matters because the phone otherwise seems aimed at outdoor and field users. Without a high peak brightness figure, sunlight visibility is a question mark.

• Camera system is poorly documented

  • The selfie camera is specified, and a thermal sensor is listed, but the main rear camera setup is missing.
  • No video specs are provided. If photography or video quality matters, this is a major uncertainty.

• No listed IP rating

  • For a phone this large and utility-oriented, many buyers will expect water and dust resistance.
  • The spec sheet does not provide an IP68/IP69K or MIL-STD rating, so it would be risky to assume rugged durability beyond what is explicitly stated.

• Gaming is possible, but this is not a gaming phone

  • The chipset and GPU are respectable, but there is no listed cooling system and no gaming triggers.
  • The phone’s weight also makes long handheld gaming sessions less comfortable.

• USB details are concerning or unclear

  • The specification says USB Type-C is false, while USB charging and USB host are supported and OTG is listed as false.
  • That combination is unusual. Buyers should confirm the port type and accessory support before purchasing.

3. Who It’s For

The F115 Ultra is for people who want a phone that behaves partly like a power bank, navigation device, and field tool. It is not for people who want elegance, pocketability, or flagship camera polish.

Ideal user

This phone makes the most sense for:

• Outdoor workers
• Long-haul drivers and delivery workers
• Campers, hikers, and emergency-preparedness buyers
• Users who need multi-day battery life above all else
• People who want a backup charging device built into their phone
• Buyers who need a large screen for navigation, maps, inventory, or field apps

Where it excels

• Multi-day use away from power

  • The 20,000 mAh battery is the main reason to buy it. If your normal phone dies before the day ends, this is the opposite experience.

• Navigation-heavy days

  • Broad GPS support plus a huge battery makes it well suited to long mapping, delivery, hiking, or travel sessions.

• Work environments where wired audio still matters

  • The headphone jack is useful for calls, radios/adapters, or simple wired headsets.

• Travel and connectivity

  • Broad 4G/5G bands, Wi-Fi 6, Bluetooth 5.4, NFC, and dual SIM support make it versatile on paper.

• Utility and inspection use

  • The thermal sensor could be valuable for certain practical tasks, though buyers should look for real demonstrations before relying on it professionally.

Where it falls short

• Everyday pocket comfort

  • The size and weight are the deal-breakers. This is not a casual lifestyle phone.

• Photography confidence

  • Missing rear camera and video specifications make it impossible to recommend this to camera-first buyers.

• Fast top-ups

  • A 33 W charger cannot quickly fill such a huge battery.

• Outdoor screen visibility

  • The phone may last outdoors all day, but the 480-nit typical brightness may not be ideal under strong sun.

• Guaranteed long-term software support

  • Android 16 is welcome, but no update policy is listed.

Price-to-value assessment

At around €363, the F115 Ultra offers strong value if you specifically want a massive battery, 5G, plenty of RAM/storage, and practical utility features. Its performance specs are better than many endurance-focused phones in this price range.

But its value depends heavily on your priorities. If you compare it to normal midrange phones, it loses on portability, design comfort, likely camera confidence, and charging convenience. If you compare it to rugged battery monsters, the huge battery and modern connectivity make it compelling — provided you verify durability ratings and port details before buying.

4. Buyer’s Decision Framework

1. Do you genuinely need a 20,000 mAh phone, or would a normal phone plus a power bank be better?

• Buy the F115 Ultra if you regularly spend long periods away from outlets and want one device that can survive multiple days.
• Skip it if you only occasionally need extra power. A lighter midrange phone plus a compact power bank may be much easier to live with.

2. Can you tolerate the size and weight every day?

• If you carry your phone in a work bag, vehicle mount, backpack, or jacket pocket, the bulk may be acceptable.
• If you use your phone one-handed, keep it in jeans pockets, or hold it for long reading sessions, 710 g is likely too much.

3. How important are cameras and video?

• If you mainly take practical photos in good light, the camera uncertainty may be acceptable, though the missing rear camera specs are still a concern.
• If you mainly shoot photos at night, record video, capture family moments, or care about social media-ready camera quality, look elsewhere unless independent camera samples prove otherwise.
• If you need thermal imaging for utility tasks, the F115 Ultra is interesting, but confirm the app experience, accuracy, and real-world usefulness before treating it as a professional tool.

Verdict

Buy the F115 Ultra if battery life is your top priority and you want a rugged-style, utility-focused Android phone with 5G, a large 120 Hz display, lots of memory, expandable storage, NFC, strong navigation support, and reverse charging potential. For field workers, travelers, drivers, campers, and emergency-prep users, it offers a lot for around €363.

Skip it if you want a comfortable everyday phone, a reliable camera-first device, fast full charging, premium display brightness, or guaranteed rugged credentials. The 20,000 mAh battery is genuinely useful, but it turns the F115 Ultra into a heavy specialist tool rather than a mainstream smartphone.

The key trade-off is simple: extraordinary endurance in exchange for extraordinary bulk.