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Daniel Greenberg

Bunk - 100% wireless, hot-swappable smartphone battery ⚡️

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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.

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Daniel Greenberg
Maker
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
@15greenberg Reserved and shared. Your design is crazy good, Apple could sell it in their stores
guillaume cabane
@15greenberg How do you do QI charging through the magnetic plate?
Will Kail
Maker
@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.
Dmitri Kyle Brereton
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
Maker
@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!
Mirco Wilhelm
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
"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
@_jacksmith which one? I somehow wasn't aware they exist, would like to look into it
Jack Smith
ImAfricanJesus
@anna_0x @_jacksmith Definitely not the first wireless battery pack but its unique and different than anything else.
Anna Filou
@_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.
Charles Postiaux
Looks really cool! As a traveler and digital nomad, I’m using my phone quite a lot throughout the day and out off battery pretty quickly. This could really help me!
Lino Grubben
A hardware product! And what a clever and beautiful one! We need more of them here! 😄
Krishna Murari
Great job on the product's design, looks super chic. Picked one up for myself! Curious to see how the N52s do their job. Quick feedback on the website: Picking a color while checking out could be more visual. Had to scroll through the landing page a few times to figure how each color(+pattern) would look.
Afshin Pishevar
wish i had it right now
Jordi Bruin
Looks really cool @15greenberg and @willkail ! I noticed that the video on your site mentions 70% charge and 40% off, while the text says 80% and 50%. Maybe something to look into. These would be great to rent out at festivals as well! Also, I would love to see the actual colors that are up for ordering. Right now it's not clear to me what the blue color looks like for example. Same goes for the white and black, do they have the spots on them etc?
Joon Kee Park
Nice! Looks like a big improvement to my battery pack
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