With the iPhone Duo bringing an entirely different shape to the iPhone lineup, you'll need accessories built for it as well. BMX built the Solid Safe Duo specifically around the iPhone Duo. It's designed to fit perfectly on the back without bleeding over and includes a stand.
The reason the Solid Safe Duo fits the iPhone Duo's proportions is the battery cell itself. BMX used a custom-made 5,000mAh semi-solid-state cell rather than a standard lithium-ion cell, giving them the flexibility to build a compact form factor for the iPhone Duo's specific dimensions. The semi-solid-state battery contains significantly less liquid electrolyte than conventional lithium-ion batteries, which reduces the fire risk associated with heat, physical damage, or internal short circuits.
The integrated rotating ring stand is designed around how people will use the iPhone Duo. It rotates 360 degrees and stays attached as the phone's position changes, so you don't have to remove the battery pack every time you shift how you're holding the phone. The battery charges your iPhone Duo at up to 15 watts via MagSafe or up to 20 watts through the attached USB-C lanyard cable, which stays with the power bank. A full-color LCD displays remaining battery capacity and live charging wattage simultaneously.
The Solid Safe Duo is priced at a premium over generic MagSafe battery packs, but for the iPhone Duo, accessories designed specifically for it maximize its value. Less expensive batteries will likely launch in the coming months, but if you want one at launch, this looks like a solid option. It is available from Amazon or directly from BMX.
Source: 9to5Mac · Summarized by HeadlinesBriefing