Watching your phone battery slide toward single digits on a late commute is a familiar kind of dread. The usual answer is a chunky 10,000mAh brick plus a cable, great for weekend trips, but it lives in your bag rather than on your phone. You pull it out, plug it in, and wait, tethered to an accessory that feels more like emergency gear than something you want to carry daily.
Xiaomi’s UltraThin Magnetic Power Bank offers a different trade. It measures just 6 mm thick and weighs 98g, closer to a slim phone case than a battery pack. The 5,000mAh cell snaps onto the back magnetically and supports 15W wireless charging on Xiaomi 17 series devices, 7.5W on iPhones, and up to 22.5W over USB-C when you need a faster wired boost.
Designer: Xiaomi
That 6mm profile matters once you start carrying it. Most magnetic packs are comfortable for a few hours, but eventually feel like strapping a deck of cards to your phone. This one reads closer to a thin case, so the phone still slides into a pocket without turning into a sandwich. The aluminum alloy shell and fiberglass phone side keep it rigid and cool, with four LEDs and a button handling the basics.
The appeal becomes clear when you spend a day with it snapped on. You can top up during a train ride or while answering emails at a café, wireless charging happening in the background without cables snagging on jackets. The 5,000mAh capacity is not a weekend solution, but it rescues a modern flagship from the red and carries it through the evening without hunting for an outlet.
Charging behavior splits along ecosystem lines. Xiaomi’s own phones get the full 15W wireless speed, while iPhones are capped at 7.5W, which lines up with how Apple treats non-MagSafe Qi chargers. You can also plug a second device into the USB-C port for up to 22.5W, turning the pack into a tiny hub when you are carrying earbuds or a second phone that needs a quick wired charge.
Xiaomi built in a graphite sheet and dual NTC temperature sensors to manage heat, along with ten layers of protection covering overvoltage, overcurrent, and foreign-object detection. This is the quiet engineering that lets you forget the pack is there, rather than something you babysit, especially when it is charging wirelessly against glass and metal in a pocket or on a crowded train where airflow is minimal.
The UltraThin Magnetic Power Bank leans hard into comfort and daily carry, accepting a modest 5,000mAh capacity to hit that 6 mm profile. People who live in cities often bounce between power sources all day, and mostly need a safety net rather than a suitcase battery. This battery pack that feels like part of the phone instead of an accessory might be the more useful kind of upgrade, even if it means plugging in overnight.
