The best power bank for iPhone Duo is one shaped for its closed body, and right now that is the BMX SolidSafe Duo ($79.99), the world's first power bank built for iPhone Duo and, as of September 10, 2026, the only one you can actually buy. Its custom 5,000mAh semi-solid-state cell sits in a 77 x 88mm body that stays within the closed iPhone Duo's 84.1 x 117.8mm footprint instead of hanging past an edge. It snaps on magnetically with up to 15W wireless output, charges by its attached USB-C cable at up to 20W, shows live wattage on a color display, and doubles as a 360-degree stand. If you want more capacity than 5,000mAh, the BMX SolidSafe 10K ($79.99) gives you 10,000mAh by cable. For Apple's fastest published wired result you also need a 60W-capable USB-C adapter, and the BMX GaNSta 70W ($59.99) qualifies.
Apple announced iPhone Duo on September 9. Preorders open October 16 and it ships October 23, starting at $1,999. Close it and you are holding something 84.1mm wide and 117.8mm tall, which is shorter and wider than any iPhone a magnetic power bank has ever been designed for. That is the whole problem. Most magnetic banks are tall rectangles built for a tall phone. The charging standard will probably work. The shape may not.
Our picks for iPhone Duo
Chosen by fit, charging method, capacity, and battery chemistry:
Best for iPhone Duo
1. BMX SolidSafe Duo 5K - $79.99
Built around the closed iPhone Duo footprint. A custom 5,000mAh semi-solid-state cell in a 77 x 88 x 11mm aluminum body, so nothing overhangs the edges. Up to 15W magnetic wireless, up to 20W through the attached USB-C lanyard cable, a full-color display that shows battery percentage and live wattage, and a 360-degree rotating ring that props the phone in portrait or landscape while it charges. The world's first power bank built for iPhone Duo. Baseus has announced a Duo pack for November; as of September 10, 2026, SolidSafe Duo is the one that is shipping. Buy now, $79.99 →
Best for capacity, by cable
2. BMX SolidSafe 10K - $79.99
10,000mAh of semi-solid-state capacity with dual USB-C at 30W total, a color display, and a built-in cable. It has a standard tall shape, so on iPhone Duo treat it as a wired bank: plug in, do not count on snapping it to the back. BMX has not tested its magnetic fit on iPhone Duo. Pick this if you run the inner display all day and want headroom for a second device.
The wall charger Apple's fastest result needs
3. BMX GaNSta 70W - $59.99
Not a power bank, but it belongs on this list because iPhone Duo ships with a cable and no adapter. Apple's "up to 50 percent in around 20 minutes" claim requires a 60W-capable or higher USB PD adapter and cable. Either USB-C port on the GaNSta 70W delivers up to 70W, so it meets that requirement, and the LCD shows you the wattage the phone actually accepts. A 70W adapter does not make iPhone Duo a 70W phone; the phone decides what it draws.
iPhone Duo power bank comparison
| Option | Shape on closed iPhone Duo | Wireless | Wired | Capacity | Battery | Price |
|---|---|---|---|---|---|---|
| SolidSafe Duo | 77 x 88mm, within the 84.1 x 117.8mm footprint | Magnetic, up to 15W | USB-C 20W, cable attached | 5,000mAh / 19.55Wh | Semi-solid-state | $79.99 |
| SolidSafe 10K | Standard tall shape; use by cable on iPhone Duo | Qi2 15W on standard iPhones; fit on Duo not tested | Dual USB-C, 30W total | 10,000mAh | Semi-solid-state | $79.99 |
| Typical magnetic bank you already own | Shaped for a taller phone; measure it against 117.8mm and the camera | MagSafe or Qi2, usually 15W to 25W | Varies | Varies | Usually conventional lithium-ion | Varies |
Shape matters more than wattage this time
Every magnetic power bank on the market was drawn around a phone that is roughly 145 to 165mm tall. iPhone Duo closed is 117.8mm tall and 84.1mm wide, with a camera unit at the top and a hinge down one side. Put a tall pack on that and one of three things happens: it hangs past the bottom edge, it crowds the camera, or it sits where the hinge does not want it.
SolidSafe Duo starts from the other direction. The 77 x 88mm body is 7mm narrower and about 30mm shorter than the closed phone, which leaves room for the camera and keeps every edge of the pack inside the phone's outline. That is why it exists. The custom cell is not a spec line; it is what makes the shape possible.
One honest boundary: dimensions prove the pack stays within the footprint. They do not prove how a specific third-party case, magnet ring position, or hinge clearance behaves. BMX will publish mounted-device results when retail iPhone Duo units are available.
Five things to check before you buy any power bank for iPhone Duo
1. Footprint. Compare the pack to 84.1 x 117.8mm. Anything taller than the phone is a no. Anything close to it needs to clear the camera unit at the top.
2. Wireless standard. iPhone Duo supports MagSafe and Qi2 up to 25W. Any magnetic pack will negotiate a rate the phone accepts, and the pack's printed maximum is a ceiling, not a promise. SolidSafe Duo offers up to 15W magnetic wireless output.
3. Wired output. Apple's fastest published result needs a 60W-capable adapter, which no pocket power bank delivers. A 20W USB-C bank is a normal wired top-up. A 30W bank gives headroom for a second device.
4. Capacity. Apple has not published the iPhone Duo battery in mAh or Wh. Treat 5,000mAh as a top-up and 10,000mAh as a bank you carry on purpose. Do not believe anyone quoting an exact number of full charges yet.
5. Chemistry. A magnetic bank spends hours pressed against a $1,999 phone. Semi-solid-state cells use significantly less liquid electrolyte than conventional lithium-ion, which reduces the fuel for a fire if a cell is damaged. Every BMX SolidSafe bank uses them.
The stand is the feature you will use most
A folding phone is bought for its screen, and a screen is only useful if it stays where you put it. SolidSafe Duo's 360-degree ring props the closed phone upright for calls and reading, and props the open phone in landscape for video, while it charges. No other magnetic power bank was designed around that.
How fast will a power bank charge iPhone Duo?
Apple's numbers first. Apple says iPhone Duo reaches up to 50 percent in around 20 minutes with a 60W-capable or higher USB PD adapter and cable, and up to 50 percent in around 30 minutes with a 35W or higher adapter and a MagSafe Charger. Both tests used a drained, open phone. Apple does not publish a full 0 to 100 time, and charging slows as the battery fills, so you cannot double those numbers.
A power bank will not match the 20-minute result, because no pocket bank is a 60W-capable source. What you get from SolidSafe Duo is up to 20W by cable and up to 15W magnetically, with the phone controlling how much it takes based on battery level, temperature, and alignment. BMX has not yet measured the exact curve on a retail iPhone Duo, so you will not find a minutes-to-50-percent claim here until that test exists.
Cable or magnets?
Use the attached USB-C cable when you want the higher ceiling and less heat. Snap on magnetically when you want the phone propped up and charging without a cord. On a folding phone the stand is the feature you will use most.
You will also need a wall charger, and it has to be 60W-capable
iPhone Duo ships with a 1-meter USB-C cable and no adapter. Apple's fastest published wired result requires a 60W-capable or higher USB PD adapter and a cable rated for it. Your old 20W iPhone brick will charge the phone, just not at that pace.
The BMX GaNSta 70W clears the bar with 70W on either USB-C port, uses GaN to stay compact, and its LCD shows the wattage the phone is actually accepting, which is the honest way to learn what "60W-capable" means for this phone. It also covers a MacBook Air, so it can be the one adapter in the bag.
The GaNSta 70W is the BMX charger that meets Apple's 60W-capable requirement for iPhone Duo, with a per-port LCD so you can watch the phone negotiate. See the GaNSta 70W →
Why chemistry matters on a $1,999 phone
A magnetic power bank spends hours against your phone, in your pocket, or on the nightstand. Conventional lithium-ion cells contain flammable liquid electrolyte, the chemistry behind every major power bank recall. SolidSafe cells are semi-solid-state, with significantly less liquid electrolyte than conventional lithium-ion. In BMX internal testing, fully charged SolidSafe cells were drilled, cut, and punctured without fire or thermal runaway. That reduces risk; no battery is risk-free.
SolidSafe Duo
The phone changed shape. So did the power bank.
5,000mAh semi-solid-state, up to 15W magnetic wireless, 20W USB-C with the cable attached, live-wattage display, 360-degree stand. Available now in black for $79.99, before iPhone Duo ships October 23.
Buy SolidSafe Duo, $79.99See full details → Free U.S. shipping. 30-day returns. 2-year warranty.
Frequently Asked Questions
Will my current MagSafe power bank work with iPhone Duo?
It will probably charge, because iPhone Duo supports MagSafe and Qi2 up to 25W. Whether it fits is a separate question. Measure it against the closed phone's 84.1 x 117.8mm body and the camera unit before you count on it. Our keep-or-replace guide walks through the five checks.
Does iPhone Duo support Qi2?
Yes. Apple lists MagSafe and Qi2 wireless charging up to 25W. A magnetic power bank still delivers only what it is built to deliver, so a 15W pack stays a 15W pack on a 25W phone.
Is a 5,000mAh power bank enough for iPhone Duo?
For a daily top-up, yes. Apple has not published the phone's battery capacity, and energy is lost in the transfer, so no one can honestly promise a full recharge from 5,000mAh. If you run the inner display all day, the SolidSafe 10K by cable is the safer amount of headroom.
Do I need a 60W charger for iPhone Duo?
Only for Apple's fastest published result: up to 50 percent in around 20 minutes needs a 60W-capable or higher USB PD adapter and cable. A 20W adapter still charges the phone, more slowly. The phone controls what it draws, so a bigger adapter cannot hurt it.
What if it does not work with my case, or I change my mind?
Orders on heybmx.com have a 30-day return window from delivery, for unused items in original packaging with all accessories. Return shipping on a change-of-mind return is on you; defects are covered by the 2-year warranty. Ships free in the U.S. from California, usually within 1 to 3 business days.
When does iPhone Duo come out?
Apple opens preorders October 16, 2026 and ships October 23, 2026 in the United States, starting at $1,999. SolidSafe Duo is available now, so it can be waiting when the phone arrives.
Sources
iPhone Duo dimensions, charging claims, MagSafe and Qi2 support, in-box cable, and launch dates: Apple iPhone Duo technical specifications and Apple Newsroom, September 9, 2026. Charging taper and heat behavior: Apple, Charge and maintain your iPhone battery. MagSafe power conditions: Apple MagSafe Charger guidance. USB Power Delivery negotiation: USB-IF. Qi2 25W: Wireless Power Consortium. BMX product specifications from the current SolidSafe Duo, SolidSafe 10K, and GaNSta 70W product pages, verified September 10, 2026.
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