Solly 300 W Foldable Power Bank Packs Solar, Integrated Charger and Laptop‑Ready USB‑C

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What’s new

The Solly power bank is a compact 300 W energy hub that tries to solve two common travel‑gear pain points: the need for a separate wall charger and the bulk of a traditional power brick. At 3.1 × 2 × 1.4 inches and 14.1 oz, it folds a US, EU or UK AC plug into the chassis, so the cord stays out of the way when you’re on the move. A built‑in solar panel can trickle‑charge the 74 Wh (20 000 mAh) solid‑state cell in an emergency, while a detachable USB‑C cable doubles as a lanyard for quick access.

How it compares

Feature	Solly	Typical competitor
Capacity	74 Wh (20 000 mAh)	50‑60 Wh common in 20 000 mAh packs
Maximum output	300 W total (140 W per USB‑C, 20 W USB‑A)	130‑200 W total, usually 65 W per USB‑C
Input options	140 W USB‑C, fold‑away AC plug, solar (≈5 W)	65‑100 W USB‑C, optional AC wall brick
Form factor	Foldable plug, integrated lanyard cable	Fixed plug or separate charger
Battery chemistry	Solid‑state Li‑ion (no liquid electrolyte)	Conventional liquid Li‑ion
Price (Kickstarter)	$89 (early‑bird)	$120‑150 for similar wattage

The most striking spec is the 300 W combined output. Two USB‑C ports can each deliver 140 W, which is enough to charge a 65 W‑rated laptop such as the Dell XPS 13 or a 90 W‑rated ultrabook like the Lenovo Yoga 9i at full speed. By contrast, most high‑capacity power banks top out at 130 W total, forcing users to split power between a laptop and a phone.

The solid‑state cell is another differentiator. Traditional lithium‑ion packs use liquid electrolyte, which can swell or vent under mechanical stress. A solid‑state design eliminates that risk, offering better thermal stability and a longer cycle life. In practice, the Solly should stay cooler during a 300 W burst, though real‑world testing will be needed to confirm the claim.

The fold‑away AC plug adds true “plug‑and‑play” convenience. Instead of lugging a separate brick, you plug the Solly directly into a wall socket and draw power from the same unit that stores it. The plug folds flat against the case, keeping the device’s profile unchanged. Competing packs either omit an AC inlet entirely or require a bulky external adapter.

Solar charging is modest – the integrated panel is rated at roughly 5 W under ideal sunlight. It won’t refill the 74 Wh cell quickly, but it can add a few percent per hour, enough to keep a phone alive in a pinch when grid power is unavailable.

Who it’s for

• Frequent travelers and digital nomads who need a single device that can both charge a laptop and act as a wall charger in hotel rooms or co‑working spaces.
• Field engineers or outdoor enthusiasts who value the built‑in solar panel and the rugged solid‑state chemistry for occasional drops or temperature swings.
• Backpack‑friendly power users who dislike the extra bulk of a separate AC brick and appreciate the fold‑away plug and lanyard cable.

If your primary use case is occasional phone charging, the Solly’s high wattage and integrated AC plug may be overkill. For users who regularly run a 65‑90 W laptop off a portable source, the 300 W ceiling provides headroom for future, more power‑hungry devices.

Risks and considerations

The device is currently being funded on Kickstarter, which means backers assume the usual campaign risk. Early‑bird pricing starts at $89, but shipping is not guaranteed until the campaign reaches its funding goal and the manufacturer clears production. Potential buyers should review the campaign’s update logs for prototype photos, thermal testing results, and any changes to the estimated delivery window.

The solar panel’s output is low, so it should be viewed as an emergency supplement rather than a primary charging method. Also, while solid‑state cells are touted as safer, they are still relatively new in mass‑market power banks, so long‑term reliability data is limited.

Bottom line

The Solly power bank packs a rare combination of high wattage, integrated AC charging, a fold‑away plug and solid‑state safety into a pocket‑sized chassis. At $89 it undercuts many similarly powered competitors, but the Kickstarter model carries the usual uncertainty of a crowdfunded product. For travelers who need laptop‑grade power without an extra charger, Solly is worth watching; for casual users, a conventional high‑capacity power bank may still make more sense.