The best Samsung Galaxy S9 battery cases

The best Samsung Galaxy S9 battery cases to keep you powered up

samsung galaxy s9 review
Julian Chokkattu/Digital Trends

Samsung’s Galaxy S9 is a technical marvel of a machine. It combines the raw power of the Snapdragon 845, drop-dead good looks, and a stunning dual-aperture camera that’s blowing the socks off everyone who dares look at it. But if there’s one thing we’re not sure about, it’s the battery size. A 3,000mAh battery capacity isn’t small, but we’ve found it can struggle hitting a full day quite often.

Thankfully, there’s an easy way to remedy that problem. Battery cases offers all the protective options of a good case, but they also pack in an extra battery that’s able to extend your phone’s battery life. Here are our picks:

i-Blades Modular Smartcase with Smartblade ($99)

smartblade best galaxy s9 battery cases

Battery cases can be quite large, and you don’t always need that extra power at every single moment. If you don’t want to carry a bulky case all the time, then check out the Smartcase with Smartblade from i-Blades. The extra battery power comes in the form of the Smartblade, which snaps onto the back of the Smartcase, providing up to 10 hours of extra battery power. When it’s spent, you can quickly detach it and attach another if you still more juice. What’s more is you can also expand your available memory with the Smartblade’s SD card slot. Strangely enough, the Smartcase also monitors air quality around you, and the case itself is slim, lightweight, and made of a durable polycarbonate shell with a soft touch finish.


ZeroLemon 4,700mAh Battery Case ($40)

zerolemon best galaxy s9 battery cases

If you’re looking for something on the cheaper side that won’t let you down, ZeroLemon is well known for supplying good value battery cases. 4,700mAh of extra power offers around 32 hours of extra talk time, according to ZeroLemon, and it also comes with a battery indicator on the rear side so you know when it’s time to charge back up. The indicator also functions as an on-off switch, so you can choose when you want the case to kick in, and it works well as a protective case too, with a strong build and raised bezel to protect the edges of your phone. It’s big and bulky, but when you’re adding this much extra battery, expect some compromises.

Amazon ZeroLemon

Alpatronix 4,000mAh Wireless-Charging Compatible Battery Case ($50)

alpatronix best galaxy s9 battery cases

If you’re looking for a little more utility in your battery case then you might be tempted by this case from Alpatronix. While it’s not as large as the ZeroLemon case, 4,000mAh of additional power is still a pretty huge boost for your Galaxy S9. It’s definitely going to score some points with wireless charging fans, as the case still lets you wirelessly charging. Simply pop it on a pad and it’ll charge both the phone and the case at the same time. The case also offers extra grip and shock absorption with a rubberized coating. There’s charge-and-sync capabilities when plugged into a PC, and a battery indicator on the rear means you always know when it’s time to charge.


Casessary 4,500mAh Extended Battery Case ($80)

casessary best galaxy s9 battery cases

Who says battery cases can’t also have a little style? Casessary‘s battery case comes with a leather-style back panel that adds a little touch of fashion to your extra battery power, as well as offering a bit of additional grip. The 4,500mAh of extra power more than doubles your S9’s battery life, adding a good few hours. Four LED lights on the back show the case’s charge level, and it uses a dynamic power management system to ensure your phone doesn’t dangerously overcharge. It’s big and chunky, but it’s also pretty protective with a raised bezel, cushioned frame, and hard outer shell.


Mophie Juice Pack ($100)

mophie best galaxy s9 battery cases

Mophie is the undisputed king of the mountain wherever battery cases are concerned. While the Mophie Juice Packs don’t always have the largest capacity, their quality speaks for itself. The Mophie Juice Pack for the Galaxy S9 comes with 2,070mAh of extra battery power, and while that’s the lowest on this list by far, Mophie said it’s enough to power the phone for an extra 29 hours. It has priority charging too, so plugging in a charger will charge up the phone first and the case second. The case itself offers solid drop protection and cushioned corners. It’s lightweight and slim, and simply one of your best options. It’s available in April, and it will set you back $100.



Exclusive: Take a look at what a next-generation 5G phone will look like

With 5G phones debuting at MWC in mere days, there is discussion about whether they will be clunky bricks that die after a few hours? A reference design from Qualcomm offerrs a glimpse of the future: This is what 5G phones will look like.
Emerging Tech

Exploding vape pen battery starts fire on SkyWest flight

A vape pen battery caused a fire in an overhead bin on a SkyWest Airlines flight on Wednesday. It's the latest in a string of incidents where faulty or poorly made lithium-ion batteries have caused gadgets to catch fire.
Smart Home

Ring adds color night vision to wired security devices and HDR to wireless ones

Ring rolled out color night vision to its wired security products with cameras such as the Spotlight Cam Wired. At the same time, Ring added HDR control to its battery-powered security devices including the Video Doorbell 2.

These 30 useful apps are absolutely essential for Mac lovers

There are literally hundreds of thousands of great software programs compatible with MacOS, but which should you download? Look no further than our list of the best Mac apps you can find.

In 2019, laptops are better than ever. Here are the best of the best

The best laptop should be one that checks all the boxes: Great battery life, beautiful design, and top-notch performance. The laptops we've chosen for our best laptops you can buy do all that — and throw in some extra features while…

New Apple patent hints clamshell-style foldable phone may be in the works

Apple has filed a patent for a foldable phone that suggests the company could be following in the footsteps of the likes of Samsung and Huawei. The patent describes a clamshell-style foldable phone with two separate sections.

Xiaomi Mi 9 will be one of the first phones with monster Snapdragon 855 chip

Xiaomi's next major smartphone release will be the Mi 9, and the company hasn't held back in giving us a good look at the phone, revealing the design, the camera, and a stunning color.

Galaxy Watch Active isn't official yet, but you can see it in Samsung's own app

Samsung may be about to resurrect its Sport line of smartwatches under a new name: The Galaxy Watch Sport Active. Leaks and rumors are building our picture of the device at the moment.

Stop buying old tablets, says Samsung, buy the new Galaxy Tab S5e instead

Samsung has launched the Galaxy Tab S5e -- the E is for Essential -- a reasonably priced tablet that includes many of the features we like from the Tab A 10.5, and the Tab S4. Here's what you need to know.

Bag yourself a bargain with the best budget tablets under $200

The battle for your budget tablet affections is really ramping up. Which tablet, costing less than $200, should be commanding your attention? We take a look at some different options for the budget-conscious.

What is Wi-Fi 6? Here's a look at the next evolution of the wireless standard

We're exploring the new naming convention for wireless standards, how it affects the devices you buy, and what the upcoming Wi-Fi generation is changing for the better.
Home Theater

Samsung accidentally leaks its new Galaxy Buds ahead of launch

It's been all but certain that Samsung would launch a successor to its Gear IconX wireless earbuds soon, but a newly leaked photo and recent FCC certification document seems to indicate that the debut is very close.

Focals succeed where Google Glass fumbled (but do we really need smartglasses?)

It’s been seven years since Google took the wraps off Google Glass. Now, we’re finally getting a modern-day equivalent we want to wear. North’s Focals combine subtle style with an intuitive interface to craft smartglasses you’ll…
Home Theater

Hi-res streaming audio service Qobuz arrives in U.S., threatens Tidal’s monopoly

For several years, Tidal enjoyed a monopoly on hi-res music streaming in the U.S. Now, French company Qobuz is here to offer some competition with a variety of monthly plans starting at $10 a month.