USB power banks are the ultimate solution for avoiding low-battery anxiety. After careful research and testing for over 70 hours, we've concluded that the Zendure SuperMini 20W is the best choice for charging phones, tablets, and small devices. This reliable, lightweight power bank is a reliable option for when you lack access to a wall outlet. Quick charging, long battery life and simple operation make it the perfect pick to give you much-needed peace of mind.
- Powerful outputWe searched for power banks with enough wattage to ensure the fastest possible charging and recharging speeds.
We looked for power banks that had the highest wattage to ensure the quickest charging and recharging speeds.
- 8 ounces or lessWe sought out power banks weighing 8 ounces (half a pound) or less, making them easy to carry around in a wallet, pocket, or bag.
We looked for power banks weighing 8 ounces or less for easy portability in your wallet, pocket, or bag.
- High capacity ratingWe preferred power banks rated for between 1,000 and 10,000 mAh capacity, which tells you roughly how much battery life they hold.
We favoured power banks with a capacity of between 1,000 to 10,000 mAh, a measure of their battery life.
- One-year warrantyWe chose power banks with a warranty of at least one year, giving you plenty of time to use it and ensure it’s not a dud.
We picked power banks with warranties of one year or more, giving you plenty of time to use and assess it adequately.
Our pick
Zendure SuperMini 20W
The best power bank for phones, tablets, and more
This is the smallest and lightest 10,000 mAh power bank we’ve tested. It has USB-C PD and USB-A ports, it comes in several colors, and its rounded edges make it easy to slip into a pocket.
The Zendure SuperMini 20W is the epitome of slim and lightweight power banks - small enough to be portable, yet large enough to charge most smartphones three times over. With the USB-C Power Delivery (PD) port and the accompanying USB-C cable, you can charge handheld devices and recharge the power bank itself quickly. It alsosports a USB-A port to accommodate pre-existing, non-USB-C devices. Moreover, its rounded design makes it easy to hold and store, and its array of color choices - including red, green, black, silver, blue, and pink - make it all the more attractive.
Key specs
Rated Capacity: 10,000 mAh (36 Wh)Weight: 6.4 ouncesTested Input: 19.3 watts (USB-C PD port)Tested Output: 18.6 watts (USB-C PD port) and 16.6 watts (USB-A port)
The research
Why you should trust me
I'm the author of this guide and I've put in 21 hours of research, as well as 55 hours of testing USB power banks and portable chargers. I'm a science journalist with close to a decade of experience across a huge range of topics from particle physics to satellite remote sensing. Having joined Wirecutter in 2017, I've written reports on surge protectors, USB-C cables and adapters, portable power stations, and other related items.
Who this is for
Most folks would benefit from having a USB power bank (aka external battery pack, backup battery, or portable charger) to keep phones and other tech charged while on the move. But how to select the one that would work best for you? Depending on your lifestyle, you might simply need a small battery to increase your phone's battery life at the end of the day, or if you travel a lot, you might be looked for a more powerful one which can power multiple devices over several days. Rather than having to search for a wall outlet on your trip, owning a USB power bank provides convenient portability with limited power supply.
You might have plenty of charging options, like at the office, home, or in the car. But having a pocket-sized power bank is valuable during times when you're nowhere near an outlet and your phone is running out of juice. For longer trips, there are still plenty of larger power banks small enough to fit in large pockets, purses, or laptop bags. With them, you can get two or more full charges for your smartphone, plus charge other devices like headphones, computer mice, keyboards, cameras, and vaporizers.
Most people could use a USB power bank. The question is, which one best fits into your habits?
Carrying a power bank when you're exploring an unknown area can give you an extra sense of security. You may also want to keep a couple of them at home. One by the front door will make sure your phone is charged when you run out, while another near the sofa could be convenient if you’re lounging and don't want to move to plug in.
How we picked
With modern devices' processing power increasing far faster than battery tech, USB power banks have swiftly gained notoriety as trusted allies in the fight against battery woes. We pooled data from major retailers like Home Depot, Amazon, and Target, as well as sought trusted editorial sources such as CNET, PCWorld, TechRadar, and PCMag, to build out a list of contenders based on a selection of features including:
- Powerful charging and recharging: For models with USB-C output or input, we preferred those rated for at least 15 watts. That’s the minimum wattage needed for full USB-C charging and recharging speeds (though devices that support the even faster USB-C standard—USB Power Delivery, or USB PD—need at least 18 watts). Likewise, for models with USB-A output or Micro-USB input, we looked for those rated for 8 watts or more. Anything less powerful would be painfully slow.
- No heavier than half a pound: Power banks should be small and lightweight, making them easy to tote around in a wallet, pocket, or bag for an entire day. We preferred to test power banks weighing 8 ounces or less, since we don’t think most people want to carry something in their pocket or purse that weighs much more than a smartphone (for reference, an iPhone 13 weighs 6.1 ounces and a Pixel 5a weighs 6.5 ounces).
- Capacity rating of 1,000 to 10,000 mAh: The capacity rating listed on the power bank tells you roughly how much power it can hold. For reference, an iPhone 13 battery has a capacity of a little more than 12 watt-hours (about 3,300 milliampere hours), and a 16-inch MacBook Pro battery has a capacity of 100 watt-hours (about 28,000 mAh). Power banks with a capacity rating of more than 10,000 mAh tend to be bigger, heavier, and more expensive, so for this guide we focused primarily on lower-capacity power banks—those that store enough capacity to give your phone a boost of power or to fully charge it several times without weighing you down. Our favorite power banks for laptops with USB-C or AC charging have much higher capacity ratings than the chargers we recommend here.
- At least a one-year warranty: A year is plenty of time to use your power bank and make sure it’s working properly, although longer warranties are, of course, always preferable.
- Brand reputation: We favored brands that we’ve had mostly good experiences with in the past when it comes to responsive customer support, widespread availability, and capability to keep models in stock. We discounted models still undergoing a crowdfunding campaign, as well as brands lacking a visible web presence.
- Price: We used a ratio of capacity (mAh) per dollar to break ties between otherwise similar models.
- Built-in cables: We preferred power banks with some type of built-in cable or plug. This type of feature is indispensable when executed well, since separate charging cables (even if they’re neatly coiled up) take up more space in a bag.
We wound up testing 23 power banks as a result of this process:
- Anker PowerCore 10000 PD Redux
- Anker PowerCore Fusion 5000
- Anker PowerCore Fusion 10000
- Anker PowerCore III Fusion 5K (discontinued)
- Anker PowerCore Slim 10000 PD
- Clutch V2 (Lightning) (discontinued)
- Clutch V2 (USB-C) (discontinued)
- Flux 4000 mAh Ultraslim Portable Charger
- HyperJuice 18W USB-C + Lightning Battery Pack (discontinued)
- HyperJuice 18W USB-C + Lightning Battery Pack (discontinued)
- Mophie Powerstation Hub
- Mophie Powerstation PD
- Mophie Powerstation Plus (USB-C)
- Mophie Powerstation Plus Mini (discontinued)
- Mophie Powerstation Plus Mini (USB-C)
- RAVPower 10000mAh Power Bank (RP-PB186)
- Real Graphene G-Lite (discontinued)
- TG90° Portable Charger 6000mAh External Battery Pack
- TravelCard Charger (discontinued)
- Tronsmart Trim 10000mAh USB-C Power Bank
- Zendure SuperMini 20W
- ZMI PowerPack 10K USB-C Power Bank (QB910)
- ZMI PowerPack Ambi 10K Dual USB-C Power Bank (discontinued)
How we tested
To ensure accurate results, we assessed each power bank in several vital areas, such as:
- Weight: We used an Escali Primo Digital Scale to confirm the advertised weight of each power bank.
- Size: Rather than measure the length, width, and depth of each power bank—which would have been tedious, and not terribly meaningful for most people—we considered size in terms of whether a power bank fit inside a wallet, a pocket (we tried a variety of pants, skirt, and jacket pockets), or an accessories pouch.
- Look and feel: We took note of each power bank’s bulk and exterior texture. We considered how easy and intuitive its features—such as the power buttons, charging-status lights, built-in cables, fold-out AC plug, or flashlight—were to use.
- Charging output of USB-A ports: We measured USB-A output by connecting a half-charged power bank to a PortaPow and a Drok USB load tester. We then turned up the amperage of the load tester as far as it could go without overloading the power bank and recorded the volts and amps we measured with the PortaPow to calculate the maximum output (watts).
- Charging output of USB-C ports: We measured USB-C output by connecting a half-charged power bank to a Total Phase USB Power Delivery Analyzer, an Apple USB-C cable, and a MacBook Pro. We then used Total Phase’s Data Center Software, checked over the power profile and any errors, and recorded the volts and amps (to calculate the result in watts).
- USB-C recharging speed: We measured USB-C input by connecting a fully drained power bank to the Total Phase USB Power Delivery Analyzer and a 60 W MacBook Pro charger. We then ran Total Phase’s Data Center Software, checked over the power profile and any errors, and recorded the volts and amps (to calculate the input in watts).
- Micro-USB recharging speed: We measured Micro-USB input by connecting a fully drained power bank to a PortaPow USB Power Monitor, an Anker PowerLine Micro-USB cable, and an Anker PowerPort II wall charger plugged into a wall outlet. We then recorded the volts and amps we measured with the PortaPow to calculate the input (watts).
- Nintendo Switch compatibility: Because this popular gaming console is notoriously finicky when it comes to charging, we plugged each of the power banks into a half-charged Switch to make sure they could charge it at least partially. All of our picks passed this test.
Our pick: Zendure SuperMini 20W
Our pick
Zendure SuperMini 20W
The best power bank for phones, tablets, and more
This is the smallest and lightest 10,000 mAh power bank we’ve tested. It has USB-C PD and USB-A ports, it comes in several colors, and its rounded edges make it easy to slip into a pocket.
The Zendure SuperMini 20W has got it all when it comes to juicing up your smartphone or other small device on the move. It's an ultra-portable dynamo – the size of a deck of cards, yet as weighty as an iPhone 13 – plus its charge rating is second to none. Whether you're seeking a reliable power bank you can conveniently tuck into your pocket or handbag that has enough juice to charge most smartphones three times, this is the ultimate device.
The Zendure includes both a USB-C PD port (capable of both output and input) and a standard USB-A port offering output-only. In our testing, we achieved a maximum output of 18.6 watts and maximum input of 19.3 watts from the USB-C port, and a max output of 16.6 watts from the USB-A port; this is lower than its 20 W output rating, yet it's still strong enough to charge most compatible devices at top speed from either port, plus it can power two devices simultaneously at slightly reduced speeds. Its 10,000 mAh capacity means you can charge your device up to three times per charge - and make instant friends with any stranger requiring a quick top-up of their device's battery.
The exterior of the Zendure boasts a tough, glossy plastic shell that holds up well against scuffs and scratches. It's small too at just 3.1 x 2.2 x 1 inches and barely weighs 6.4 ounces - lighter than any other 10,000 mAh power bank we tested - as much as a hockey puck! There are also a variety of colors to choose from like red, green, black, silver, blue, and pink.
You can rest assured that Zendure stands behind its SuperMini unit with its two-year warranty—far longer than any other model we've evaluated. Plus, our superior customer service experience with Zendure spans more than five years of testing its products.
Flaws but not dealbreakers
A major upside to the SuperMini is its size-to-power ratio. It packs a charge of 10,000mAh in a very small package, while most of our other picks require a separate plug to recharge. Also, its lack of built-in cables can be an advantage, since this allows it to charge a wider variety of devices, especially older ones with out-of-date connectors. However, its lack of built-in cables means that we have to provide and transport our own, offering an extra level of hassle. Not only is the cable bulky, it can get tangled and easily misplaced. Still, we appreciate the lightweight design and the immense power it brings in a tiny package, making the extra burden of packing a separate charging cable or two worth it.
Though we're not huge fans of the SuperMini's prominent ridges that give it a hardshell suitcase-like look, it serves a practical purpose. Identified by its tactile protrusions, it's easy to find stored away in your clutch or handbag. What's more, these slight protrusion make the power bank a bit easier to grip than its completely smooth-surfaced competitors.
Other good power banks
If the SuperMini's unavailable, the Anker PowerCore 10000 PD Redux and PowerCore Slim 10000 PD are close alternatives in terms of capacity and portability. They each have 10,000 mAh and a USB-C PD port (for top speed smartphone and handheld charging) along with USB-A output. Though they're each slightly larger than the SuperMini (weighing 6.8 and 7.4 ounces respectively), they remain very pocketable. Ultimately, pick between them based on price and your preferred shape and color.
If you want to sacrifice some power for a softer feel, the ZMI PowerPack 10K USB-C Power Bank (QB910) is an excellent choice. It has a 10,000 mAh capacity, ergonomically rounded edges, and weighs 7.4 ounces—comparable to the weight of an iPhone 13 Pro. While the maximum output of its USB-C PD port is lagging at 16 W, its USB-A port delivered a commendable 15.6 W. Taking charge, the USB-C PD input measured 16.9 W, with a mere 4 W coming from the Micro-USB. Alongside the USB-C cable, it also comes with a two-in one cable (Micro-USB with a USB-C adapter) and a cloth bag. The exterior, made of a soft, tightly woven marled-gray twill, has a sophisticated, stylish look and is fairly durable, though it can still be stained.
If you're looking for a power bank that can also act as a wall charger, the Anker PowerCore Fusion 10000 is your best choice. It features a slim, pocketable design, has a fold-up plug for added convenience, and comes with useful battery-status lights so you know when to charge it. It has an impressive rated capacity of 10,000 mAh, enough for three full phone charges, a textured matte finish with a comfortable grip, and is available in three colors – black, white, and red. Admittedly, this device is significantly bigger and heavier than our top pick at 9.6 ounces, but if capacity is your priority, this is the power bank to get.
What to look forward to
Come spring 2023, we'll be testing our top pick against contenders from the following models to decide which one comes out on top!
- Belkin BoostCharge Plus 10K
- Clutch V3 Lightning (iPhone)
- Clutch V3 USB-C (Android)
- Mophie Powerstation Cube 10K
- Mophie Powerstation Plus
- Nimble Champ Portable Charger
- Panasonic BQ-CC87ABBA
- Panasonic BQ-CC87AKBBA
- Scosche GoBat 10K
- TravelCard Plus
- Ugreen 20W PD 10000mAh Power Bank
- Zendure SuperMini X3
- Zendure X5
- ZMI PowerPack 10K Ultra Model QB816
Sustainability and power banks
Using a power bank responsibly is the best way to sustain its lifespan and reduce your impact on the environment. Take care of your device and ensure that it's protected at all times; this way, you won't need to replace it for as long as possible. Avoid scratches, scuffs, and dents by storing it in a pouch or cable organizer, and make sure to store it in a cool, dry space (aim for about 40% charge). By extending its life, you can reduce your dependence on nonrenewable materials and, therefore, lessen your environmental footprint.
If your power bank stops working, iFixIt and Instructables can provide helpful instructions on fixing most types of electronics. However, if it’s beyond repair or is no longer able to hold a charge, it should be recycled. Even though most Americans recycle paper, plastic, metal, and cardboard, less than half (subscription required) properly recycle used batteries and other electronics. If e-waste isn't recycled, it can end up in a landfill, where it can leak heavy metals and other hazardous materials into surrounding soil and water. Furthermore, it encourages the mining of fresh resources in order to create new electronics, instead of finding value in old ones.
Looking to recycle power banks and other e-waste? Here are some excellent options:
- Find e-waste recycling facilities in your area using searchable databases like Call2Recycle, Earth911, GreenCitizen, or Greener Gadgets. Most municipalities don’t offer curbside pickup for battery recycling, but many have designated dropoff sites. Before dropping off batteries at a recycling facility, make sure it accepts lithium-ion batteries (the type found in most power banks and many other household electronics), since they may require different safety precautions than other battery types.
- Keep an eye out for local e-waste recycling drives—or try organizing one yourself!
- Mail in a prepaid shipping container from TerraCycle, Call2Recycle, or another recycle-by-mail service.
The competition
For those in search of a power bank that doubles as a wall charger, the Anker PowerCore Fusion 5000 is our former pick. This device offers 5,000 mAh of rated capacity, a fold-up plug for convenience, and a pocketable size and shape. Though, note that its ports (two USB-A output ports and a Micro-USB input port) are less powerful than those on our top pick.
The Flux 4000 mAh Ultraslim Portable Charger is light and compact at mere 3.1 ounces, easily fitting into your pocket. With Micro-USB input port, USB-A output port, and integrated USB-C and Lightning cables, this stylish charger is available in a variety of colors. Yet, fumbling with the charging cables to get them back in their slots can be a nuisance, while the materials they are made of are a bit too flimsy.
The intelliArmor Scout Max is a real multi-tasker; it has a built-in AC plug and Micro-USB port for self-charging, and the integrated Lightning, Micro-USB, and USB-C cables can power pretty much any handheld device. Unfortunately, it's not so easy to extract the cables and plug, and its 10,000 mAh capacity lags behind that of several competitors. Moreover, there's no information about a product warranty or customer support available on the company's website.
Despite the Mophie Powerstation Hub having a larger capacity than the Fusion III model - 6,000 mAh compared to the latter's - and able to charge wirelessly via Qi, we still think it's not worth the usual $100 tag. Besides, its angular shape makes it more cumbersome to grip and doesn't make it ideal to store in pockets.
At a glance the Mophie Powerstation PD has all the hallmarks of a great choice—it's light, pocket-friendly, and has a nice, grippy texture. However, its capacity of 6,700 mAh is dwarfed by the far heavier SuperMini pick.
The Mophie Powerstation Plus (USB-C) and Mophie Powerstation Plus Mini (USB-C) may be slim and lightweight, but the integrated USB-C cables are a nightmare to slot back into their places - no doubt an exasperating experience for many!
The RAVPower RP-PB186 10000mAh Power Bank is a great alternative to the Anker Redux, with nuances like rough ridges at each of its seams detracting slightly from the comfort of holding it. Yet if you can get it for a much lower price, it's still worth considering.
At just 4.1 ounces and with a capacity rating of 6,000mAh, the TG90° Portable Charger 6000mAh External Battery Pack is one of the smallest and lightest power banks we've tested. It boasts additional convenient features, such as two built-in cables (USB-C and Lightning) that slide in and out of their holsters, and a USB-C input port. Its build and sturdy construction are further draws. However, we don't feel comfortable recommending it until it has gone through sufficient long-term testing - the company appears to have no web presence outside of its Amazon storefront.
The Tronsmart Trim 10000mAh USB-C Power Bank packs the same capacity rating as our SuperMini, plus it boasts a Micro-USB input port. Still, we think its added input won't be a major boon to most folks, and we think the look and feel of our picks win out.
