Compact magnetic power bank combining a custom-made semi-solid-state cell, 360° ring stand and full-color display in a body that matches iPhone Duo’s new proportions.
Better Mobile Xperience (BMX), a mobile power and accessories company, has developed SolidSafe™ Duo around a custom-made 5,000mAh semi-solid-state cell built for Apple’s reported iPhone Duo, its upcoming foldable iPhone. Measuring just 77 x 88 x 11mm, the compact magnetic power bank stays within the phone’s edges 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 iPhone Duo’s folding screen. It supports the device in portrait for reading and messaging, landscape for watching content, or partially folded for hands-free calls, viewing and other everyday tasks, all while the phone continues to charge.
The rotating design allows SolidSafe™ Duo to remain attached as the position of the phone changes, giving users greater freedom to make use of the foldable display without having to remove 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-made 5K cell: Built around iPhone Duo’s unique footprint.
• Semi-solid-state battery: Uses significantly less liquid electrolyte than conventional lithium-ion.
• 360-degree rotating kickstand
• Full-colour 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 SolidSafe™ Duo is a custom-made 5,000mAh semi-solid-state cell containing significantly less liquid electrolyte than conventional lithium-ion battery technology. The lower liquid content reduces the amount of flammable electrolyte within the cell and helps minimise the fire risk associated with heat, physical damage or internal short circuits.
The semi-solid-state architecture also gives BMX greater flexibility in creating a compact battery around the specific dimensions of iPhone Duo. This allows SolidSafe™ Duo to combine a substantial 5,000mAh capacity with a slim 77 x 88 x 11mm body, while maintaining the magnetic charging and integrated stand functionality required for everyday use.
15W magnetic or 20W via lanyard cable.
SolidSafe™ Duo charges wirelessly at up to 15W or delivers up to 20W through its attached USB-C lanyard cable. Its full-colour TFT LCD shows remaining battery capacity and live charging wattage, so users can see both how much power is available and how quickly it is being delivered.
The attached cable also supports up to 15W input to recharge SolidSafe™ Duo. Because the cable stays with the power bank, there is no separate charging cable to carry or search for when it is needed.
The compact 11mm body is housed in CNC-machined aluminium, providing a rigid enclosure while helping dissipate 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 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. Having spent some hands-on time with a review unit, the standout revelation is its versatility across the current smartphone ecosystem
Despite being tailored for a specific foldable footprint, this 5,000mAh power bank fits absolutely perfectly on both the Motorola Razr Fold and the iPhone 16. The compact 77 x 88 x 11mm dimensions ensure it sits flush against the back of both devices without awkwardly overhanging the edges.
The inclusion of a 360-degree rotating ring stand is genuinely useful for day-to-day tasks, allowing you to prop up your phone in portrait or landscape modes while it continues to charge. Additionally, having a built-in USB-C lanyard cable means you can easily bypass the 15W wireless charging to get up to 20W of wired power without hunting for a spare cord.
Good Points
- Perfect fit: Sits flawlessly 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 multiple viewing angles, adapting easily whether your phone is flat or partially folded.
- Integrated cable: The built-in USB-C lanyard delivers up to 20W of wired charging and means you never leave the house without a cable.
- Informative display: The full-color TFT LCD provides clear, live readouts of both your remaining battery capacity and the active charging wattage.
Bad Points
- Capacity limit: While the custom semi-solid-state cell is highly compact, a 5,000mAh capacity means heavy users will likely only get about one 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 on AmazonUS and AmazonUk from October 2026.
Conclusion.
The BMX SolidSafe Duo might be pitched around Apple’s upcoming foldable, but you don’t need to wait for Apple to make a move to get real value out of it. If you are 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, sturdy 360-degree ring stand, and that integrated USB-C lanyard mean you are paying for genuine usability rather than just another generic power bank. It is a clever, well-thought-out piece of kit that solves real daily annoyances, making it easy to recommend if you want a compact charger that stays firmly out of your way.