Mophie Powerstation Keychain Portable Battery REVIEW. Keyring power bank

What Can I Bring?

Planning ahead and packing properly can facilitate the screening process and ease your travel experience at the airport. Know what you can pack in your carry-on and checked baggage before arriving at the airport by reviewing the lists below. Even if an item is generally permitted, it may be subject to additional screening or not allowed through the checkpoint if it triggers an alarm during the screening process, appears to have been tampered with, or poses other security concerns. Read about civil penalties for prohibited items.

  • For items not listed here, our AskTSA team looks forward to answering your questions 365 days a year; live assistance is available from 8 am – 6 pm (ET).
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The final decision rests with the TSA officer on whether an item is allowed through the checkpoint.

Officers may ask you to power up your electronic device, including cell phones. Powerless devices will not be permitted onboard the aircraft. TSA does not read or copy information from your device.


Baby Carrier

You may transport this item in carry-on or checked bags. For items you wish to carry on, you should check with the airline to ensure that the item will fit in the overhead bin or underneath the seat of the airplane.

Battery powered wheel chairs and mobility devices

  • Carry On Bags: No
  • Checked Bags: Yes (Special Instructions)

Spillable batteries are allowed in wheelchairs and mobility devices, where the battery may remain installed if it is securely attached to the mobility device and the battery housing provides protection from damage, the terminals are protected from short circuit, and the battery remains in an upright position when stowed on the aircraft. See FAA regulations

Non-spillable batteries may require additional measures based on battery type. See FAA regulations.

Lithium metal (non-rechargeable lithium) batteries are forbidden with these devices.

Lithium ion batteries must be removed from this type of mobility device and battery terminals protected from short circuit. The battery must be protected from damage (e.g. by placing each battery in a protective pouch). The lithium ion batteries must be carried in carry-on baggage only. The passenger must advise the airline of the battery location. The airline must notify the Pilot-in-command of the battery location in the cabin.

For complete passenger instructions contact your airline. Advance arrangements and extra check-in time may be necessary. The airline may need to remove the battery and package it separately if the wheelchair cannot be stowed upright in the cargo compartment.

Wheelchairs and other mobility devices are permitted through the checkpoint but not permitted into the cabin of the aircraft.

Belts, Clothes and Shoes

To help TSA officers get a clear look at your bag and reduce the need for additional screening, we suggest you pack your bag in neat layers.

Mophie Powerstation Keychain Portable Battery REVIEW

Since smartphones play such an active role in our lives these days, it’s important to have a power solution nearby to make sure you always have your mobile phone at the ready. It’s been a long time since I’ve carried a power bank with me everywhere, but I found that the Mophie Powerstation keychain is the ideal option for a little emergency boost when you are running low on power.

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The Powerstation Keychain is a miniature power bank that connects to your keychain, belt loop, or bag with a carabiner. It’s a 1200mAh battery that can give your mobile device hours of power in an emergency situation. This power bank is designed for USB-C devices and has a built-in USB-C cable. The cable is hidden beneath the keychain attachment, which saves space on the device. The charger has priority charging to provide power to a connected device before the Powerstation recharges itself when it’s connected to a power source. There is a four-light LED indicator that shows how much life is left on the Powerstation. The power bank is available in one color (black) and retails for 39.95 (MSRP).

  • COMPATIBILITY: Palm, Samsung Galaxy, Google Pixel, other USB-C devices
  • DIMENSIONS: 3.15 x 1.5 x 0.6in (80 x 39 x 15mm)
  • WEIGHT: 2.1oz (60g)
  • WARRANTY: 2-year Warranty
  • IN THE BOX: powerstation keychain / carabiner / quick start guide


The Mophie Powerstation Keychain comes in simple packaging with Mophie branding and an image of the product on the front. It’s noted on the front that there are 4 hours of battery included in the battery and that it’s a USB-C connector. The 4 hours of battery time is estimated for the Samsung Galaxy S9 (3 hours for the Google Pixel 3, 8 hours for the Palm). While I love that it is utilizing USB-C as its main charging method, I do wish that maybe it came with adapters for Lightning charging devices, too. I just think that would make it more versatile for those who use multiple devices.

During my testing of the Powerstation Keychain, I attempted to charge my iPhone XS Max, 2018 11” iPad Pro, Sennheiser Momentum True Wireless headphones, and a Sony Xperia 10. Each of these devices yielded different results. The iPhone XS Max is compatible with wireless charging or Lightning cables and docks. I did, however, have a USB-C to Lightning cable available so I thought I would attempt to charge the iPhone using the USB-C port located near the eject button. I found that the port is not a two-way power delivery port and can only be used for recharging. So, the USB-C to Lightning cable did not work to charge my iPhone.

Next, I tried to use the Powerstation Keychain to charge the iPad Pro. Because the power output on the Powerstation is listed as 5V/1A on the back of the battery, I didn’t think it would be able to charge the iPad, but since the iPad utilizes USB-C for charging, I thought I would see what would happen if I plugged it into the Powerstation. The battery icon in the menu bar ended up flashing. It would appear to start charging but then blink off of the lightning bolt icon that typically indicates charging. So, I unplugged it rather quickly. Since most tablets require at least 2A in order to charge, this is the response I actually expected to get. To be fair, there are no tablet models listed in the compatibility list from Mophie for the device and the power output listed on the battery doesn’t indicate that it should work.

After attempting to charge the iPad, I moved on to the charging case of the Sennheiser Momentum True Wireless headphones. This charging case uses USB-C and only requires 600mAh to have a full charge. I plugged them into the Powerstation and there was no problem getting the case charged up to full. Since my primary phone is an iPhone, I feel like this is the perfect use of the Powerstation for me — recharging my earbuds.

Finally, I plugged the Sony Xperia 10 into the Powerstation. This is a smartphone that is designed to charge using USB-C. There was a small ding that told me that the phone was charging and so I left it to charge. When I plugged the phone in, it was showing 1% battery and the Powerstation was showing 4 LEDs. which meant it was between 75-100% capacity. I did charge the phone after I charged the headphone case so I could assume that approximately 25% of the battery was used up before I plugged in the phone.

I checked the status of the phone and power bank after about 10 minutes and the phone had gained 10% battery while the power bank was now showing only three LEDs lit. I noticed at this point that the power bank was a bit warm, but not hot. After about 10 more minutes, I checked the status again and found that the phone was at 25% and so was the power bank. After a total of 45 minutes, the phone had gained 27% and the power bank was completely depleted. The Sony Xperia 10 has 2870mAh as battery capacity. That’s nearly 2.5 times larger than the Powerstation’s capacity. Given those specs, I actually would expect to get approximately 41% battery life from a fully charged Powerstation Keychain. Since the Powerstation had been used previously, I think gaining 27% battery power was the proper amount for what was available from the power bank.


I really enjoy having a solid, reliable emergency power bank to carry with me everywhere. I do want to stress that this particular power bank is designed to be strictly for emergency use only. It’s not meant to be able to recharge a smartphone 100% so if you need that, you should get a higher capacity portable battery. I really love the size of this power bank and how easy it is to carry around. I would recommend it to anyone looking for a good emergency battery.

I’m a Tech geek, Photographer, Star Wars fan, and writer for I love technology, and what people do when creating amazing apps and products. Find me on Want to know more? Just ask. Or visit our team page

Rolling Square TAU Review

The Rolling Square TAU is a.sized battery bank packing just enough juice to keep your phone going when there’s no outlet around.

Our Verdict

Save time. Get access to brief summaries of our reviews so you can browse and make decisions more efficiently.


  • Portable size fits on a keychain
  • Flexible set of connectors (USB C, Micro USB, and Lightning)
  • Dock acts as a convenient key holder by the door


  • Small 1,400 mAh capacity
  • Battery and dock combo is big despite small charge capacity
  • Metal hook is finicky to open and lock

Full Review

Get up to 20% off Rolling Square Join Pack Hacker Pro

Whenever we find ourselves in the scenic streets of a bustling city, we can’t help but take a photo or two with our smartphones. By the end of the day, we have dozens of shots coupled with enough footage of sizzling street food to treasure the tasteful memories. Apart from storage, though, there’s one other thing stopping us from taking more: battery life. This makes battery banks almost indispensable when traveling.

Battery banks are portable charging stations, and they come in all shapes and sizes to fit different needs. For Rolling Square, going small is the way to go, and they’ve really doubled down on this approach with the TAU. It’s only a bit bigger than a car key fob, so it won’t require a separate backpack or sling. It’s also fairly easy to use day-to-day, courtesy of its magnetic dock and flexible set of connectors. Though, that small size comes with some downsides, which places the TAU in a special but fitting role.

Materials Aesthetic

As with most small tech accessories we use, the TAU doesn’t stand out too much. It’s black, plastic, and square. But, here’s the kicker: it fits just about everywhere. Translation: it’s small, remarkably small for a battery bank. While the techy looks aren’t unique, it’s also not a very distracting gadget to hang off a keychain, being just a tad bigger than a car key fob.

Okay, it might be a little weird having two fobs hanging off one keychain, especially if you’re the type to hang one off a belt loop. That’s a matter of taste, though. In our case, we keep our keys in our s or pants, so it’s not a problem. Small as it is, the TAU dwarfs everything else on our Orbitkey Clip Organiser. Fortunately, the TAU’s techy looks are on the smoother side of things.

The pebble-like shape is easy to hold against the back of our iPhone with just one hand, though it is a bit dangly at the same time. It also lends the TAU a sleek profile, tastefully accented by a lone metal hook at the top. We also kinda dig how the TAU logo extends from this metal hook. It’s subtle, but it plays well with the minimalist design.

Usage Features

The biggest strength of the TAU is its small size. Whereas most battery banks range from modestly-sized 5,000 mAh capacities all the way up to 20,000 mAh high capacity ones and beyond, the TAU makes do with just 1,400 mAh. Here it is next to an Anker PowerCore Magnetic 5K and Anker PowerCore Speed PD Portable Charger. Capacity isn’t a strict indicator of physical size, so it’s still important to visualize just how the TAU stacks up against its fellow battery banks.

To put the TAU’s 1,400 mAh capacity into better context, our iPhone 13 Pro Max has a 4,352 mAh battery. That’s about a third of our phone’s total capacity. This is okay, though, because the TAU isn’t meant to be an outright charger replacement. Rather, it’s for those emergency top-ups on the go.

Rolling Square makes the experience of using the TAU a thoughtful one. It comes with a dock that connects to the TAU via a magnetic prong at the bottom. The magnet is quite small, but the dock holds onto it well even when we shake it. The idea is that you mount it somewhere convenient where you can grab the TAU—and the keys attached to it—on your way out.

mophie, powerstation, keychain, portable

Rolling Square TAU | The small magnet is strong enough for the TAU’s weight.

The dock itself is quite simple, with only an LED power indicator to signal its status. It’s powered via an included Micro USB cable that connects to a port at the back underneath a panel that sticks the wall using adhesive or screws. This rear panel slips on and off the dock like the battery cover of a TV remote. This makes the dock easy to unmount from the wall when we need to take it on a trip, as the TAU cannot be charged directly with a cable.

The day-to-day process of docking, charging, undocking, and using the TAU is a relatively quick and smooth one. But, there are weaknesses in this process.

As we mentioned, the TAU cannot be charged directly via a cable and requires the dock to charge. While the dock does easily slip out of the rear panel, it’s a bulky solution comparable in size to, say, a 5,000 mAh battery bank that doesn’t require a separate dock. This extra bulk is not ideal for travel, and we’d rather just go with a bigger (and more powerful) battery bank.

It’s also worth noting that the included cable for the dock isn’t that long. It’s about two feet long, which may or may not be long enough, depending on how far away the nearest socket or USB port is. Oh, and while the cable is included, we have to supply our own wall adapter.

Next, the metal hook’s locking mechanism is quite finicky to use. To open, you have to push it outward to unhook it from a tiny indent. Since the hook is held in place by sheer tension, it has to be held open while it’s being attached to a keyring. Furthermore, the small indent is shallow enough that the hook sometimes unlocks accidentally, which makes us warier of the TAU than we’d like. In fact, the TAU fell off our keychain many times during the testing phase, way more than our acceptable standard of “never fall off at all.”

Finally, there’s the charging itself. The small 1,400 mAh capacity is only able to charge our iPhone 13 Pro Max by about 25%. Yes, that’s less than what you’d expect from a 1,400 mAh battery charging a 4,352 mAh one. But remember, our iPhone is on (and therefore using juice while it’s charging), and charging itself isn’t a 100% efficient process, so there’s gonna be some loss along the way. The printed power delivery spec on the TAU is quoted at 1A at 5V, so it’s actually quite slow, sitting at a mere 5 watts.

All of that said, 25% is nothing to scoff at when the alternative is a dead phone while you’re in the middle of nowhere. Your mileage may vary depending on what phone you’re using and how big its battery is. Regardless, the small top-up is quite handy in an emergency situation. In day-to-day use, just having the.sized TAU as an accessory conveniently attached to our keychain—always charged through the magnetic dock—is reassuring.

The TAU’s quite flexible and easy to share, too. It’s equipped with a fixed set of connectors that covers an extensive range of devices. This includes USB Type-C, Lightning, and Micro USB. We’re particularly fans of the Lightning/Micro USB combo connector since it’s a neat 2-in-1 cable. We’ve seen Rolling Square use the same connector in their inCharge 6 and inCharge X charging cables, and it’s proven useful each time we needed it since.

The left cable peels away from the side to reveal the USB Type-C cable, its connector hidden away inside the housing at the top. The right cable peels away in the same fashion, but this one has the Lightning/Micro USB connector. We have one gripe with this arrangement: the connectors are pointing upwards, arguably the most crowded portion of a busy keychain.

The small size of the TAU is an interesting take on the classic battery bank, going all-in on portability instead of capacity. It doesn’t quite cut it as a substitute for a high-capacity one, and it’s a bit rough around the edges in areas like the metal hook and the dock system. Nonetheless, the TAU fulfills its role as a backup battery bank and is a nice.sized boost when you’re far from a socket.

SOS KeyRing. PowerBank

The perfect solution for those times weather in the Wilderness exploring or for your day to day life and your phone battery is running low or about to die. With a capacity of 1500 mAh, This ultra-light, portable power bank is all you need to keep your device running during those off-the-grid moments, And your day to day outings, Equipped with a switch so there’s no need for a data line / charging wire the advanced

circuit design offering multiple protection points against overcharge, over discharging, short-circuiting and overloading. This SOS key ring power bank offers fast charging and safety in one compact package!, Versatile in size, super slim ( just 2.75 1.57 0.7 inches ) and ultra lightness (1.4 oz) of The SOS KeyRing. Power Bank fits neatly into purses or s, Jackets, you name it. its an all-round essential solution for all your charging emergencies! Specifications:

  • Shell Material: PVC.

mobile phone ports : for Apples Android, its fitting for both users!

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