At a look
Professional’s Score
Professionals
- Tremendous-compact energy financial institution
- May give iPhone a 30% cost
- USB-C/Lightning/USB cables inbuilt
Cons
- You in all probability will neglect to cost it
Our Verdict
The tiny Tau 2 is a good and reasonably priced back-up battery that may squeeze out sufficient juice to recharge the iPhone to almost a 3rd of its full potential whereas weighing subsequent to nothing and taking on barely any house.
Value When Reviewed
This worth will present the geolocated pricing textual content for product undefined
Finest Pricing Right this moment
Finest Costs Right this moment: Rolling Sq. Tau 2
We’ve seen lots of tiny energy banks undergo the Macworld Labs: some super-slim, some capable of recharge an iPhone almost twice over, others with cables included and flashy shows displaying you ways a lot battery life is left. One energy financial institution even has a flowery mild which may brighten up a cloudy day.
GaN (Gallium Nitride) expertise makes transistors smaller and due to this fact units akin to chargers extra diminutive. That is now placing fairly severe performance into very small issues certainly.
And we’ve by no means seen an influence financial institution as small because the Rolling Sq. Tau 2, which needs to be the important thing ring that saves you simply as your iPhone’s battery provides up the ghost of the sub-10% you’re shocked to appreciate by no means received a cost up earlier than you left the home.
The place most energy banks are cumbersome—though the newest 5K magnetic energy banks are positively skeletal—the Tau 2 is smaller than an AirPods case however hosts a 2000mAh (7.4Wh) battery pack that in our checks refilled an iPhone 16 Professional by simply over 30%. We evaluate the finest magnetic energy banks in case you are prepared to sacrifice some bulk for larger battery capability.
Simon Jary
In dimension it measures 2.2 x 1.7 x 0.7 inches (5.6 x 4.3 x 1.9cm). It’s just a little smaller and lighter (1.7oz vs2.2oz; 49 vs 61g) than an AirPods Professional case.
The intelligent factor in regards to the Tau 2 is that it doesn’t require you to all the time have a cable on you if you’re out and about—how many individuals do? In the event you’re canny sufficient to pack a cable each time you exit, try to be brilliant sufficient to have remembered to cost your cellphone within the first place. Most of us typically fail on each counts.
Take away the key-friendly hooked lid to disclose two cables: a USB-C for something new (iPhone 15 and later) and Lightning for older iPhones and AirPods circumstances.
Simon Jary
The Lightning cable even works as MicroUSB—the fiddly little connector that historical past ought to have consigned to the dustbin, however which doggedly lives on in low cost Chinese language devices.
In the event you do nonetheless personal an iPhone older than the 15, it should supply pass-through charging with USB-C as enter and Lightning as output.
You possibly can even cost two units on the identical time, which is the place a second USB-C cable moderately than Lightning could possibly be helpful to early adopters.
In case you have all USB-C Apple devices the Lightning cable is moderately superfluous. We’d have most well-liked an possibility with two USB-C so the pass-through can go each methods, however I do personal an older Lightning AirPods case, so it’s nonetheless helpful to me. If solely it might cost my Apple Watch too.
Maker Rolling Sq. guarantees that “you’ll always remember to re-charge it”, which in fact is nonsense, however the firm does provide you with choices. You possibly can plug in straight right into a USB-C charger utilizing its little cable, or energy it up by way of its personal its Charging Dock that—with the included double-sided adhesive—will be firmly caught to a wall, desk, or any clear, flat floor that may maintain it.
It’s also possible to plug it straight into one in every of your MacBook’s Thunderbolt ports to cost it up from the laptop computer.
Simon Jary
In the event you preserve your keys on a hook, simply connect the Tau 2’s charging dock proper subsequent to it.
I’m proud of my AirTag keyring and will join the Tau 2 to that however want to maintain the tiny energy financial institution in a pocket in my backpack for emergencies—however you possibly can comply with Rolling Sq.’s advice and use it as your predominant key ring when you fancy. The hook is safe, though not as gripping a repair as an old style metallic ring.
The Tau 2 does work with an NFC tag to create a Misplaced Mode, in addition to doubtlessly share your Digital ID by way of the identical route, however to suit higher into the Apple ecosystem a FindMy perform can be appreciated.
Simon Jary
Value
The Rolling Sq. Tau 2 is priced at $39.90 / £39.90 / €39,90. Verify our price-comparison widget for extra dwell costs close to you.
Must you purchase the Rolling Sq. Tau 2?
I’m joyful to hold round a slim magnetic energy financial institution in my backpack, and more often than not I bear in mind to maintain it charged prepared for when my iPhone provides out miles away from a wall charger. However I’m typically caught out and need to limp round in Low Energy Mode on just a few proportion factors of battery life.
The tiny Tau 2 is a good and reasonably priced back-up battery that may squeeze out sufficient juice to recharge the iPhone to almost a 3rd of its full potential whereas weighing subsequent to nothing and taking on barely any house.
