100% wireless, hot-swappable smartphone battery ⚡️

#2 Product of the DayDecember 10, 2018
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Bunk is an external battery that magnetically sticks to your phone and gives you 80% more charge throughout the day.

Wireless - No cables, no fasteners, no worries.

Magnetic - Snaps to your phone effortlessly.

Auto On/Off - Starts charging when attached, automatically turns off when detached.

  • Jack Kim
    Jack KimFounder @ Ember Labs

    Beautiful product design, solves a big problem



    My iPhone always runs out of battery but I refuse to buy any of those battery cases out there since they're so bulky and ugly. This looks to solve that, and the magnetic snapping feature looks super cool.

    Jack Kim has never used this product.
  • Pros: 

    Extra Battery Life, Hot-swappable


    Requires a separate case, Lacks universal support for Android and Iphone

    Why this requires a specific iphone case is beyond me. Their same tech could be made universal by just pulling the mag tech out of the case and making it an adhesive to back of phone/current case.

    James Alexander has used this product for one week.
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Daniel Greenberg
Daniel GreenbergMakerPro@15greenberg · Making weird internet
Hey Product Hunters, Don’t you hate it when your battery runs out at the most important times? But don’t want to resort to ugly, heavy power bricks and cases? We designed Bunk from the ground up to be the most convenient, easy to use portable smartphone battery ever. It just snaps to your phone magnetically and start charging! 80% of smartphone owners suffer from “range anxiety” but we all know how inconvenient (and ugly) existing battery cases and power bricks are. So we built Bunk to solve that. Packed with a 1800mAh battery, 3-coil magnetic transmitter, and magnets with 80N of force, Bunk snaps perfectly onto your phone every time and provides charge. Other features include: •Auto on/off — shuts off when detached •Pass-through charging •Support for devices without wireless charging (via our super-thin receiver) We’re so happy to share our invention with you and we’d love to hear any kind of feedback! Thanks! Daniel and Will
Lino Grubben
Lino Grubben@linogrubben · Product Designer
@15greenberg Reserved and shared. Your design is crazy good, Apple could sell it in their stores
Adithya Shreshti
Adithya Shreshti@adithya · Founder of Knowmad Life | Startuposphere
@15greenberg This looks 'delicious' haha! Wish we had options with more juice and not just 1800 mAH.
guillaume cabane
guillaume cabane@guillaumecabane · Growth Advisor | Speaker
@15greenberg How do you do QI charging through the magnetic plate?
Will Kail
Will KailMaker@willkail · Designer and maker, currently in Bristol
@guillaumecabane Hi Guillaume! The magnetic layer has been carefully designed. We've placed the magnets on the far edges of the part to avoid it interfering with QI charging.
Mirco Wilhelm
Mirco Wilhelm@bindermichi · IT Architect
For someone who just bought a 10'000 mAh wireless charging powerbank with USB A and C ports in similar size for less money, they do look kind of pricey to me.
Jack Smith
Jack Smith@_jacksmith · Serial Entrepreneur & Startup Adviser
"The world’s first wireless battery pack" seems like a cool product and it looks a nice color etc. but this statement is very disingenuous and unnecessary. I've had a wireless battery pack for over a year from other manufacturers.
Anna Filou
Anna Filou@anna_0x · Tech Geek, Web Designer, Illustrator
@_jacksmith which one? I somehow wasn't aware they exist, would like to look into it
Jack Smith
Jack Smith@_jacksmith · Serial Entrepreneur & Startup Adviser
@anna_0x @_jacksmith Definitely not the first wireless battery pack but its unique and different than anything else.
Anna Filou
Anna Filou@anna_0x · Tech Geek, Web Designer, Illustrator
@_jacksmith @imafricanjesus thanks, I guess I somehow missed the whole wireless revolution 😆 I do agree though that Bunk here looks pretty unique but part of the appeal probably comes from the nice marketing.
Dmitri Brereton
Dmitri Brereton@dkb868 · CS @ UCLA | Indie Hacker 👨🏾‍💻
This is magical. Can you maybe give a brief explanation of how this technology works because I wasn't even aware this was possible.
Will Kail
Will KailMaker@willkail · Designer and maker, currently in Bristol
@dkb868 We're using QI Wireless Charging to supply the charge - it's a standard that has been adopted by Apple, Samsung, Google (and essentially every other smartphone manufacturer) which makes Bunk near universal. No more searching for USB-C or Lightning cables! We're really excited to get this into people's hands!
Jack Kim
Jack Kim@jack7kim · Founder @ Ember Labs
Excited to try this out!