The BMX SolidSafe Duois a compact magnetic power bank designed around the proportions of Apple's reported foldable iPhone Duo. Rather than adapting a conventional battery pack to a new form factor, BMX has built the SolidSafe Duo around a custom 5,000mAh semi-solid-state cell and added features intended specifically for a folding smartphone.
The result is a power bank that combines magnetic wireless charging, a rotating ring stand, an integrated USB-C cable and a full-colour display in a body measuring just 77 x 88 x 11mm.
At $79.99/£79.99, the SolidSafe Duo sits in the premium compact power bank category. Its appeal comes less from raw capacity and more from the way its battery, stand and cable are integrated into a single device.
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Design and Build Quality
The SolidSafe Duo measures 77 x 88 x 11mm, giving it a relatively compact footprint for a 5,000mAh power bank. BMX says the dimensions were selected to match the reported proportions of Apple's upcoming foldable iPhone Duo, allowing the accessory to remain within the phone's edges while attached.
The power bank uses a CNC-machined aluminium housing, which gives the unit a rigid construction while also helping dissipate heat generated during charging. The black finish keeps the design understated, making it more suitable for users who want a power bank that can remain attached to a smartphone without adding excessive visual bulk.
Its 11mm thickness is particularly relevant for a magnetic battery designed for a foldable phone. A power bank can quickly become inconvenient if its battery capacity comes at the expense of portability, so the relatively slim enclosure is one of the SolidSafe Duo's most important characteristics.
The aluminium construction also gives the product a more premium feel than many plastic-bodied magnetic power banks.
A 5,000mAh Semi-Solid-State Battery
The SolidSafe Duo's main technical feature is its custom-made 5,000mAh semi-solid-state cell.
According to BMX, the battery contains significantly less liquid electrolyte than a conventional lithium-ion cell. The company says this reduces the amount of flammable electrolyte in the battery and helps minimise risks associated with heat, physical damage and internal short circuits.
The semi-solid-state design also gives BMX more flexibility when designing the battery around the dimensions of the target device. That is important here because the SolidSafe Duo is not simply a generic battery pack with magnets added to the rear.
The custom cell is intended to make the most of the available footprint while retaining a useful 5,000mAh capacity.
It is worth keeping expectations around capacity realistic, however. A 5,000mAh rating does not translate directly into 5,000mAh of additional usable phone battery capacity because energy is lost during charging, particularly with wireless charging. The capacity nevertheless puts the SolidSafe Duo in a useful range for extending a smartphone's battery life throughout a day.
Magnetic Charging and 20W USB-C
The SolidSafe Duo supports up to 15W magnetic wireless charging, with supported charging levels of 5W, 7.5W and 15W.
For users who prioritise charging speed, the integrated USB-C connection provides up to 20W of wired output. This makes the cable the better option when the priority is transferring as much power as possible to a compatible device.
The attached cable is also used to recharge the power bank itself, supporting input of up to 15W.
This approach removes one of the small but persistent inconveniences associated with portable chargers: carrying a separate cable. The USB-C cable remains attached to the SolidSafe Duo and doubles as a lanyard, meaning it is available whenever the battery pack needs to be recharged or used for wired charging.
The SolidSafe Duo can also provide simultaneous USB-C and magnetic wireless output, rated at 10W + 5W.
That gives the power bank some flexibility beyond its primary use with a single smartphone.
The 360-Degree Ring Stand
One of the more interesting aspects of the SolidSafe Duo is its integrated 360-degree rotating ring stand.
The stand is designed around the flexibility of a foldable phone. It can support the device in portrait orientation for reading and messaging, landscape orientation for watching video, or a partially folded position for hands-free calls and other activities.
The rotating mechanism means the stand can move with the phone's position without requiring the battery pack to be removed.
That is a practical addition because a magnetic power bank attached to a foldable smartphone could otherwise interfere with how the device is positioned. BMX has instead made the stand part of the charging accessory's core design.
The stand also gives the SolidSafe Duo functionality beyond simply carrying extra battery capacity. When the power bank is attached, it can effectively become part of the phone's desktop or tabletop setup.
Full-Colour TFT Display
Another useful feature is the full-colour TFT LCD on the front of the power bank.
The display shows the remaining battery capacity as well as live charging wattage. This provides more useful information than a conventional row of LEDs, particularly when users want to know whether a connected device is actually drawing power and how quickly it is charging.
The live wattage readout can also make it easier to understand the difference between wireless and wired charging performance.
For a premium power bank, this kind of information is a welcome addition rather than a purely cosmetic feature.
Portability
Portability is one of the SolidSafe Duo's strongest characteristics.
At 77 x 88 x 11mm, it has been designed to remain relatively close to the footprint of the intended phone rather than extending substantially beyond it. That is particularly important for a magnetic battery because an oversized pack can make a smartphone uncomfortable to hold.
The integrated cable further reduces what needs to be carried alongside it.
The trade-off is that the SolidSafe Duo is designed around a very specific use case. Its dimensions and magnetic functionality make it particularly suited to compatible smartphones, while users looking for a general-purpose high-capacity power bank may find larger conventional models more appropriate.
Specifications
Verdict
The BMX SolidSafe Duo takes a familiar product category and gives it a more focused design. Its 5,000mAh semi-solid-state battery provides a useful amount of additional capacity, while the compact aluminium body keeps the overall package relatively slim.
The combination of 15W magnetic charging, 20W USB-C output, a built-in USB-C cable, a 360-degree ring stand and a full-colour display gives the SolidSafe Duo more functionality than a basic magnetic power bank.
Its strongest feature is arguably the way these components have been designed to work together. The rotating stand is useful for foldable-phone users, the attached cable reduces accessories that need to be carried, and the display provides practical charging information.
There are limitations. The 5,000mAh capacity is aimed at portability rather than replacing a large conventional power bank, while the $79.99/£79.99 price places it firmly in the premium segment. Its specialised proportions and magnetic design also make it less of a universal solution than a larger USB-C power bank.
For users who want a compact magnetic power bank with a built-in stand and display, however, the SolidSafe Duo presents a well-considered package. Its custom battery technology and foldable-phone-focused design give it a clear identity in an increasingly crowded power bank market.
The BMX SolidSafe Duo is available through BMX for $79.99/£79.99, with Amazon US and Amazon UK availability planned for October 2026. Learn more at heybmx.com.
