Despite the size of your iPhone 7 Plus' battery, you may find it's not lasting through the day, especially if you're a power user. Carrying around an external battery pack can be cumbersome, so why not streamline the process and grab a battery case instead. It'll probably bulk things up a bit, but better bulky than a brick.

Top pick

Trianium Atomic Pro

Trianium's battery case has a 4200mAh battery, which should charge your iPhone 7 Plus at least once, which basically gives you another day of use if you're a regular user. It has LED indicators to let you know how full it is, and a power button so that you only use it up when you need to. On top of battery, it also provides great protection with a hard exterior and flexible inner bumper.

$41 at Amazon

Apple's favorite

Mophie Juice Pack Wireless

Mophie's Juice Pack comes in five colors and has a 2420mAh battery, which should give you an extra half-day's worth of charge. This one's ideal if you're a power user but don't mind charging up nightly. It has LED indicators on the back and proper cutouts for speakers and your camera. This one's bulky, but it does provide solid protection, albeit expensively.

$50 and up at Amazon

Built-in magnet

Sunwell battery case

If you typically mount your phone on a magnetic car mount, then this is the case for you. It not only has a 4200mAh battery (should charge your phone at least once), but it also has a magnetic section on the back, which lets you continue using your magnetic mount without worrying about sticking the magnetic plate inside. Comes in three colors.

$33 at Amazon

Biggest battery

Maxbear battery case

If you figure you won't see an outlet for a couple days, then you'll want Maxbear's battery case, which has a 7200mAh battery. It should charge your iPhone 7 Plus 1.5 to 2 times, and the single LED indicator on the back changes color depending on how full the case is. Maxbear gives you a one-year satisfaction guarantee, so give it a try and just send it back within a year if it's not for you.

$27 at Amazon

There aren't many options to choose from when it comes to battery cases for the iPhone 7 Plus, and among those choices are some real duds, so be very choosy. For my money, the Trianium Atomic Pro is the best option, since it should keep your iPhone 7 Plus going at least all day and into the next, and it's protective without being extremely bulky.

This post may contain affiliate links. See our disclosure policy for more details.