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Whether you call them batteries, power banks or portable chargers, these accessories do one thing well: charge your devices when you can’t find an open outlet. Small enough to fit in a day bag and sturdy enough to fit in the bottom of your handbag, the batteries can charge your smartphone, tablet, laptop, or even all three at the same time, depending on the size of the battery. What size you need and any additional features you might find useful will largely depend on the devices you plan to charge. With so many options on the market right now, we’ve tested a bunch of models to determine the best portable power banks you can get right now.
Update Phone Battery Power Bank Review
Almost every rechargeable battery you can buy (and most portable devices) contains a lithium-ion battery. They surpass other current battery types in terms of size-to-charge capacity, and have even increased eightfold in energy density in the last 14 years. They also do not suffer from the memory effect (where the battery life is reduced by partial charging).
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One drawback you may have heard is the potential for lithium-ion batteries to catch fire. To limit the danger, batteries require internal mechanisms to limit things like voltage and pressure. While you still need to ensure that the battery is not subjected to undue stress, such as excessive heat, damage caused by a fall, or operation in cold weather, the batteries are considered safe enough to carry on an airplane. According to the TSA, external batteries of 100 Wh or less (which are all our recommendations) can fly with you – just be sure to pack them in your carry-on, as they are not allowed in checked baggage.
Battery manufacturers almost always list battery capacity in milliamp hours or mAh. Smaller batteries, say those that can charge a smartphone between 50 and 75 percent, usually have a capacity of 5,000 mAh. Larger batteries that can charge laptops and tablets or multiple phone charges can exceed 25,000 mAh. Not surprisingly, the prices of most batteries increase as capacity increases, and since batteries are physical storage units, size and weight also increase with capacity. If you want more power, be prepared to spend more and carry a heavier brick.
You might think that a 10,000 mAh power bank can charge a 5,000 mAh phone twice to 100 percent, but that’s not the case. Aside from simply losing power through heat dissipation, factors like voltage conversion also reduce the amount of juice that gets into your phone. Most manufacturers indicate how much battery charge a particular smartphone can withstand. In our tests, the 10,000 mAh of battery capacity translated into roughly 5,800 mAh of device charge. The 20,000 mAh chargers provide about 11,250 mAh to the device, and the 25,000 mAh bank translates to about 16,200 mAh of charge. That is an average efficiency of about 60 percent.
While the tech world is (thankfully) moving towards USB-C as a standard, it’s still a mixed bag in the world of power banks. All of our picks have at least one USB-C port, and some also have a USB-A port or two. Newer Android smartphones charge via USB-C, iPhones still use the Lightning port, but the latest tablets (including the current generation of iPads) and newer laptops tend to be powered via USB-C.
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When a battery has more than one charging port, they usually serve different functions. You’ll usually see at least one port labeled “in/out,” which means you can use it to charge both the bank and your device. While USB-A ports can power smartphones and other small devices, they cannot charge larger devices. Plus, they’re generally not as fast as USB-C ports. This is something to keep in mind when deciding which ports and cables to use to connect your phone to the pack.
There is even more variation between the USB-C ports themselves, with different ports on the same device supporting different power transfer rates. In practical terms, this means that the iPhone will charge just fine connected to the 18W port of the power bank. But to properly charge, for example, a MacBook or similar laptop, it will need the additional power provided by the 100W port (as much as larger batteries can offer). Power banks with more than one port can also charge multiple devices at the same time, but the speed and total charge delivered will be lower.
You should also consider your cable. For anything bigger than a smartphone (and to access fast charging capabilities) you need to use USB-C ports and cables. But not all cables are created equal, even if they have the same USB-C plugs on the end. If you want power to be supplied from the 100W USB-C port of the power bank, you must have a USB-C cable marked 100W. Fortunately, batteries capable of delivering 100W usually include a compatible cable. For any devices that don’t, we tried Anker’s 100W USB-C cable and liked it. For smaller devices, we used this 60W cable from Nimble, and we don’t recommend using cables below 60 W. For around $20, higher capacity cables will ensure you don’t waste time on connections that limit your potential power transfer.
For the most part, battery packs have a rectangular brick-like design, although many lean towards an aesthetic with attractive finishes and details. While this doesn’t affect its performance, it’s a consideration for something you’ll be interacting with regularly. Some portable power stations include additional features such as MagSafe compatibility, a built-in wall plug or even a stand. Almost all have some kind of indicator that lets you know how much charge you have left, usually expressed by glowing beads near the power button. Some of the big banks go a step further with an LED display that shows the percentage of remaining battery, which can be useful if you rely on the pack in a mobile office setup or similar.
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Before we even got our hands on the battery, we did extensive research. We considered brands that reviewers and staff have tried over the years, and we checked customer ratings on retail sites like Amazon and Best Buy. We received a total of 14 battery packs, from small wireless batteries to large multi-device batteries.
We’re constantly updating this guide as companies release new products, which means we have a variety of devices on hand to test. For this guide, we tested each battery with some combination of the iPhone 14 Plus, iPhone 11, Samsung Galaxy S22 Ultra, and fifth-generation iPad Air. I charged one device at a time, although some packs can charge multiple devices. I have charged phones or tablets from full to 100 percent (or until the power bank was empty) and did not use the device while it was charging except to turn it on and enter the unlocking code.
To charge the Galaxy S22 Ultra and iPad Air, I used the cable that came with each power bank. For iPhones, I used a USB-C lightning cable provided by Apple. In the case of batteries with smaller capacity that did not include a cable or one included with USB-C to USB-A connections, I used this USB-C to USB-C cable rated at 60W.
I recorded the time for each debit and the number of debits indicated by each bank. I also paid attention to things like ease of use and overall design. Here’s what made the selection for the best portable chargers:
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The ArcHybrid delivers a higher charge than Apple’s own battery, and is a fast option that attaches securely to the MagSafe ring.
I went into this category expecting Apple’s own MagSafe battery to be the best choice. And while it had excellent results, charging a dead 14 Plus to about 43 percent in an hour and 45 minutes, Spigen’s ArcHybrid delivered a charge of 56 percent in almost the same time. The ArcHybrid attaches tightly to the MagSafe ring and is flush enough that you can easily hold and use your phone while it’s charging. Unlike Apple’s battery, it includes four indicator lights that help you gauge how much juice is in the pack. Considering that Spigen’s battery is $30 cheaper than Apple’s, it’s easy to recommend.
Alternatively, Anker’s 633 magnetic battery provided a greater charge thanks to its 10,000mAh capacity, boosting the iPhone to 100 percent in three hours with enough remaining for an additional charge of 29 percent. And while the kickstand feature seemed mildly useful, the battery itself was bulky — but that’s understandable for a power bank twice the size of Spigen’s. In the end, the ArcHybrid proved to be better than a quick and convenient way to partially charge your iPhone on the go.
It is important to note that wireless charging is less efficient than wired charging. Our tests showed that wired batteries charge the device with about 60 percent efficiency. with
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