Compact magnetic power bank that combines a custom semi-solid-state cell, 360° ring stand and full color display in a body that matches the iPhone Duo’s new proportions.
Better Mobile Xperience (BMX), a mobile power and accessories company, has built SolidSafe™ Duo around a custom 5,000mAh semi-solid-state cell for Apple’s reported iPhone Duo, its upcoming foldable iPhone. Measuring just 77 x 88 x 11 mm, the compact magnetic power bank stays within the edges of the phone while charging. An integrated 360-degree ring stand supports the different ways users interact with a folding screen.
The integrated 360-degree ring stand supports the flexibility of the iPhone Duo’s folding screen. It supports the device in portrait for reading and messaging, landscape for viewing content, or partially folded for hands-free calls, viewing and other daily tasks, all while the phone continues to charge.
The rotating design allows the SolidSafe™ Duo to stay attached as the phone’s position changes, giving users more freedom to use the flip-out display without removing the power bank
We wanted the battery to feel made for the phone, with a custom fit and a stand that supports how people actually use the folding screen.
Barry Miller, Head of Marketing at BMX
KEY FEATURES
• Custom 5K cell: Built around the iPhone Duo’s unique footprint.
• Semi-solid state battery: Uses significantly less liquid electrolyte than conventional lithium-ion.
• 360-degree rotating kickstand
• Full color TFT LCD
• Built-in USB-C lanyard cable
• 15W magnetic or 20W wired charging
Semi-solid state power in a compact form.
At the heart of the SolidSafe™ Duo is a custom 5,000mAh semi-solid-state cell that contains significantly less liquid electrolyte than conventional lithium-ion battery technology. The lower liquid content reduces the amount of flammable electrolyte in the cell and helps minimize the risk of fire associated with heat, physical damage or internal short circuits.
The semi-solid-state architecture also gives BMX more flexibility to create a compact battery around the specific dimensions of the iPhone Duo. This allows SolidSafe™ Duo to combine a substantial 5,000mAh capacity with a slim 77 x 88 x 11mm body, while retaining the magnetic charging and integrated stand functionality required for everyday use.
15W magnetic or 20W via lanyard cable.
SolidSafe™ Duo wirelessly charges up to 15W or delivers up to 20W through its attached USB-C lanyard cable. Its full-color TFT LCD displays battery capacity and live charging wattage, so users can see both how much power is available and how quickly it’s being delivered.
The attached cable also supports up to 15W input for charging SolidSafe™ Duo. Since the cable stays with the power bank, there is no separate charging cable to carry or search for when needed.
The compact 11mm body is housed in CNC-machined aluminum, which provides a rigid enclosure while dissipating the heat generated during charging. Despite its compact footprint, SolidSafe™ Duo delivers a 5,000mAh capacity in a form factor built specifically around the proportions of the iPhone Duo
Hands-On Impressions: SolidSafe Duo.
While BMX officially built the SolidSafe Duo around the dimensions of Apple’s upcoming foldable, the iPhone Duo, the real-world application goes far beyond a single unreleased device. After spending some hands-on time with a review unit, the standout revelation is its versatility in the current smartphone ecosystem
Although tailored for a specific foldable footprint, this 5,000mAh power bank fits the Motorola Razr Fold and the iPhone 16 perfectly. The compact 77 x 88 x 11mm dimensions ensure that it sits on the back of both devices without awkwardly hanging over the edges.
The inclusion of a 360-degree rotating ring stand is really useful for everyday tasks, allowing you to raise your phone in portrait or landscape mode while it continues to charge. In addition, with a built-in USB-C lanyard cable you can easily bypass the 15W wireless charging to get up to 20W wired power without searching for a replacement cable.
Good points
- in thePerfect fit: Sits perfectly on the Motorola Razr Fold and iPhone 16, avoiding the awkward overhang found with many magnetic power banks.
- Versatile stand: The 360-degree ring stand supports different viewing angles, easily adjust whether your phone is flat or partially folded.
- in theIntegrated cable: The built-in USB-C lanyard provides up to 20W wireless charging and means you’ll never leave the house without a cable.
- in theInformative display: The full-color TFT LCD provides clear, live readings of your remaining battery capacity and active charging wattage.
Bad points
- in theCapacity limit: While the custom semi-solid-state cell is highly compact, a 5,000mAh capacity means heavy users will likely only get about a full charge depending on their device’s battery size.
- Premium Price: At £79.99 it sits at the higher end of the market for a 5,000mAh capacity power bank.
SolidSafe™ Duo is available on the BMX website for $79.99 / £79.99, available soon AmazonUS and AmazonUk from October 2026.
conclusion.
The BMX SolidSafe Duo might be pegged around Apple’s upcoming folding bar, but you don’t need to wait for Apple to make a move to get real value out of it. If you’re already running a Motorola Razr Fold or an iPhone 16, it fits like a glove without any of the awkward overhang that usually plagues magnetic battery packs.
At £79.99 it sits on the pricier side for a 5,000mAh capacity. However, the semi-solid-state tech, live wattage display, robust 360-degree ring stand, and that integrated USB-C lanyard mean you’re paying for genuine usability rather than just another generic power bank. It’s a clever, well-thought-out piece of kit that solves real everyday problems, making it easy to recommend if you want a compact charger that stays firmly out of your way.