UGREEN X688 Uno 100W GaN Fast Charger

UGREEN X688 Uno 100W GaN Fast Charger: Stylish, Powerful, and Packed with Personality

The UGREEN X688 Uno 100W GaN Fast Charger is a fresh take on multi‑device charging. Far from a bland power brick, it combines Gallium Nitride (GaN) technology with a playful, robot‑like TFT display and magnetic feet—making it as charming as it is powerful.GADIXOO

🧠 Design & First Impressions

The Uno charger stands out immediately with its tiny TFT screen that displays expressive emoji faces. These change dynamically based on charging status: during active charging, standby, or full charge, the power brick communicates with you through its “robot friend” persona. The screen changes across up to five different expressions, such as a ‘charging face’, a ‘cool’ completion emoji, and a standby look.

The cube‑shaped block measures roughly 2.05 × 1.93 × 3.23 inches (about 70 × 50 × 50 mm), compact enough to slip into a backpack easily yet still feeling substantial in hand (around 235–275 g depending on plug type and region). Its casing—though made of plastic—has a matte finish that feels premium, much like brushed aluminum. It hides fingerprints reasonably well and gives a durable impression.

One cute design element: two small magnetic feet double as prong covers and allow the charger to cling to metal surfaces (like a laptop lid) when not plugged in—preventing the little feet from being lost while adding portability.UGREEN

Port Selection & Intelligent Power Distribution

On top, the Uno features three USB‑C ports (labeled C1, C2, C3) and one USB‑A port. The two primary USB‑C ports can each deliver 100 W when used alone. However, as more ports are used, the power gets distributed intelligently:

• Two devices: ~65 W on C1, 30 W on C2, 22.5 W on C3 or A

• All four ports active: ~45 W (C1), 30 W (C2), ~7.5–10.5 W on C3 and USB‑A.

This flexibility lets you charge a MacBook or gaming laptop and still power your phone, tablet, and headphones simultaneously with high efficiency.

GaN Technology & Thermal Performance

Utilizing GaN (Gallium Nitride) rather than conventional silicon allows the charger to deliver high voltage in a compact form. GaN reduces overall heat generation while boosting power density, ideal for on‑the‑go users with multiple devices.

However, even GaN isn’t magic—under heavy load (particularly sustained high wattage charging), the unit may become warm. Reviews report surface temps between 50°C–75°C under continuous high load, which is generally acceptable. But anecdotal Reddit reports have cited rare units reaching 100 °C, which is unsafe and indicates a fault; such units should be returned Reddit.

UGREEN includes a thermal guard system: the charger will automatically shut off if it overheats, minimizing risk of damage or fire.

Charging Speed & Real‑World Performance

In testing, the Uno recharges multiple devices quickly and reliably. For example:

• A MacBook Air gained ~35 % charge in 25 minutes;

• A 15‑inch MacBook Pro reached 100 % in about 112 minutes—faster compared to Apple’s 87 W charger (~150 minutes)

Android devices—such as the iQoo 12, Huawei MatePad Pro, and Xiaomi tablet—also charged fast. A full stack (phone, tablet, TWS headphones) completed in roughly 1 hour 45 minutes

Users highlight the convenience of consolidating multiple chargers into one—whether at a desk or on the move. That said, actual speed depends on using quality USB‑C PD cables to support full power delivery.

Safety Features & Certification

UGREEN includes broad protection features:

• Over‑current

• Over‑load

• Short‑circuit

• Over‑temperature

• Over‑voltage protection

This provides peace of mind during multi‑device charging sessions. Some unit reviews note that temperature under load stays within safe thresholds under normal use.

Pros & Cons Summary

✅ Pros

• Playful TFT display adds fun and visual charging feedback

• High power output: up to 100 W single‑port; four‑device support

• Compact GaN design, with strong build‑quality

• Magnetic feet add portability and desk organization

• Robust safety features, including thermal shut‑off

❌ Cons

• Can get noticeably warm under sustained load—although usually within safe ranges, faulty units may overheat

• TFT screen does not display numeric wattage, only emoji expressions—some users find that limiting Port arrangement means total wattage drops when multiple devices are charging simultaneously

• No foldable prongs on most models—less ideal for travellers than variants with collapsible plugs.

Ideal Use Cases & Target Audience

The UGREEN X688 Uno is a great pick for:

• Tech enthusiasts who want a charger with personality, not just plain utility

• Users of multiple USB‑C devices—MacBooks, phones, tablets, power banks—who want to streamline their power setup

• Frequent travellers who need a powerful, compact charger that handles diverse gear (though check plug type)

• Workstation users who appreciate the magnetic feet to anchor the charger off-wall

Buying Tips & Cautions

• Check your plug configuration: US, EU, UK variants exist; they are not interchangeable.

• Use a good USB‑C to C cable with E‑marker support to achieve full 100 W PD speeds.

• If your charger gets excessively hot (above ~80 °C surface temperature) or burns your hand—stop usage and contact UGREEN immediately. That’s not typical and likely a defect.

• Remember the charging speed per port diminishes with more simultaneous connections—so single‑device speed differs from multi‑device rate.

Final Verdict

The UGREEN X688 Uno 100W GaN Fast Charger is a standout thanks to its unique combination of style, power, and practicality. It elevates the mundane task of charging by introducing personality via the TFT display, while delivering up to 100 W of fast, efficient GaN-powered performance.

Though its wattage allocation shifts under multi-device use and temperature can rise under heavy loads, for the vast majority of users it delivers a safe, compact, and fun charging experience. If you’re looking for a single power solution to replace multiple bricks—and you appreciate a dash of quirk—this Uno charger is certainly a compelling choice.