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.

i-Blades

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.

Amazon

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.

Casessary

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.

Mophie

Product Review

Samsung's Galaxy Fold proves folding phones are the future

Samsung's Galaxy Fold is finally here -- it's the company's first foldable smartphone, with three screens, six cameras, and a dual-cell battery. What's it like to use? We spent some time with it to find out.
Mobile

The Best iPhone 7 battery cases to give your phone some extra juice

The iPhone 7 doesn't have terrible battery life, but you never know when you'll need to juice up on the go. To help, here are the best iPhone 7 battery cases that can keep your smartphone charged and ready for long-term use.
Mobile

Breaking news: Samsung responds to reported Galaxy Fold display issues

The Samsung Galaxy Fold has arrived, and it goes on sale soon. Folding out from a 4.6-inch display to a tablet-sized 7.3-inch display, this unique device has six cameras, two batteries, and special software to help you use multiple apps.
Gaming

Get the most life out of your Xbox One controller with these tips

The Xbox One controller has fantastic battery life, but eventually your batteries will still die. To make it even better and ensure you never have to stop gaming, follow these tips.
Mobile

Sidestep banking fees with the nationwide launch of T-Mobile Money

T-Mobile has launched its Money banking service nationwide in the U.S., and it offers an extremely tempting set of features for everyone, including industry-leading interest rates, a powerful app, and no banking fees.
Mobile

The OnePlus 3 & 3T both receive an open beta for Android Pie

Android 9.0 Pie has been released. But is your phone getting Android 9.0 Pie, and if so, when? We've done the hard work and asked every device manufacturer to see when their devices would be getting the update.
Mobile

Selfies are now banned at China’s gigantic Aperture Spherical Telescope

You can't take a selfie with the world's largest single-dish radio telescope anymore, as the Chinese government has banned everything from smartphones to digital cameras in the surrounding 5-kilometer area.
Mobile

Charge and sync with the best Lightning cables for your iPhone or iPad

If you’re looking to replace a lightning cable, or in need of something a little longer or tougher, we’ve got you covered. Here are 10 of our favorite cables for the iPhone and other iOS devices.
Deals

Make some time for the best smartwatch deals for April 2019

Smartwatches make your life easier by sending alerts right on your wrist. Many also provide fitness-tracking features. So if you're ready to take the plunge into wearables and want to save money, read on for the best smartwatch deals.
Android

The dramatic BlackBerry Key2 Red Edition is now available in the U.S.

BlackBerry's Key2 is likely to be the best keyboard-equipped phone in 2019, with a modern look, some powerful specs, and totally revamped features. Here's everything you need to know about it.
Computing

Want to make calls across the internet for less? Try these great VOIP services

Voice over IP services are getting more and more popular, but there are still a few that stand above the pack. In this guide, we'll give you a few options for the best VOIP services for home and business users.
Digital Trends Live

Digital Trends Live: Samsung Galaxy Fold woes, zombie pigs, and more

Today's topics: Samsung Galaxy Fold, Facebook A.I. voice assistants, YouTube comes to Fire TV, facial recognition on airline flights, the SpaceX DART program, Yale's zombie pigs, and much more!
Mobile

Samsung Galaxy S10 update gives manual control of Bright Night mode

Samsung 2019 flagship smartphone lineup is here, and there aren't just two phones as usual — there are four. There's the Galaxy S10, S10 Plus, as well as a new entry called the S10e, as well as the Galaxy S10 5G.
Deals

The excellent Moto G6 is just $99 from Google Fi for a limited time

Getting a cheap smartphone can be a great way to squeeze value out of your dollars. Motorola's Moto G-range has always been good value, but never better than this: Get the Moto G6 for just $99 from Google Fi.