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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!
Jack Kim

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.

Pros:

Beautiful product design, solves a big problem

Cons:

None

Jordi Bruin
Why would you review it if you’ve never used the product before?
James Alexander

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.

Pros:

Extra Battery Life, Hot-swappable

Cons:

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

Will Kail
Maker
@james_alexander1 I think you're confused! Bunk is universal and works cross-platform/with any case! It does use an adhesive magnetic layer that sticks to the inside of your existing case. Check out our site to inform yourself a bit more about Bunk! ⚡
Anna Filou
@james_alexander1 @willkail question: even if the phone supports wireless charging out of the box (I have the Note 9), Hunk still requires a sticker/case? Can the sticker be used without a case?
Jordi Bruin
Why would you review this if you've never tried the product before?
Will Kail
@anna_0x Hi Anna! You can use Bunk without a case - you'll just need to attach our magnetic layer straight onto the back of your phone rather than on the inside of the case. We found that most people used cases but we also really wanted Bunk to work with those who choose not to use one!
Anna Filou
@willkail nice to know! Thanks
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
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.
Jack Kim
Excited to try this out!
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
Jeroen De Prest
At 50% off it is a great price but I think it might be a bit too thick for me... and my phone doesn't support wireless charging. Maybe a good idea to create a case to add wireless charging to a phone?
Jeroen De Prest
@adithya Oh yeah you are right my bad. I missed it the first time I read it.
Charlie Ward
Desperately need this product
Dun
You mean product hunt world’s first wireless battery pack? There are product like this about a year ago.
Eben Akwuruoha
Very cool, welldone @willkail
soz
@15greenberg at it again! 🔥
Scott Williams
@15greenberg This looks similar to Brickspower (http://www.brickspower.com). How is Bunk different?
Jack Smith
@scottwwilliams both products claim to be the "first wireless charger" when others are already available on Amazon.
Will Kail
Maker
@scottwwilliams Hi Scott, great question! We've been developing this with an incredibly talented design team for over a year and we've managed to identity and overcome some serious design issues with Bunk in that time. Brickspower definitely hasn't received the same level of love, and fails in a couple of areas. The main one is its attachment method - Bunk is magnetic so snaps onto any surface (including the 79% of users that use a case!) and it auto-aligns with the phone's wireless receiver coil perfectly each time. Brickspower requires a gloss surface to stick to the device, and for the user to carefully align it by eye each time they need to charge. Without perfect alignment, wireless charging becomes really inefficient. We made sure that Bunk is as simple and hassle-free as possible so that it truly works for users as a solution to on-the-go charging, it's really something special!.
Andrew Cretin

I would love if there was a way for Bunk to fasten directly to the phone, even if that meant fastening the magnetic piece directly onto your device.

Pros:

Very sleek design. Will hold in place

Cons:

Must use a phone case in order to use the product