Trianium Atomic Pro (for iPhone 7)

The Trianium Atomic Pro battery case strikes a nice balance between form and function. For $49.99 it has a 3,200mAh battery to double the life of your iPhone 7, and a protective bumper along the sides to keep it safe from drops. It’s also fairly lightweight. It’s a solid choice if you’re looking for equal parts power and protection, but the ZeroLemon Slim Juicer provides a bit more battery life for the same price.

The Atomic Pro is similar to many other battery cases out there in terms of design. The back panel is made of black polycarbonate with a soft-touch finish for grip. Along the sides is a detachable bumper that snaps in to hold your phone in place place while also providing drop protection. It locks in firmly, so you don’t have to worry about your phone coming loose, but that means getting it on and off is a struggle. You have to lift up from the bottom right corner, though most of the time you’ll have to work your way along the sides to peel it off and get your phone out.

On the plus side the case is quite light. It weighs 3.7 ounces, making it lighter than the Slim Juicer (5.3 ounces) and just a bit heavier than the Mophie Juice Pack Air (3.5 ounces). And at 5.9 by 2.7 by 0.4 inches (HWD), it matches the svelte Flux Battery Case in terms of dimensions.

Trianium Atomic Pro (for iPhone 7)

Along the sides you’ll find the standard buttons and ports. The power button and volume rocker are both rather mushy. There’s a cutout for the ringer switch on the left, and the bottom has a micro USB charging port that supports pass-through syncing. The case comes with a micro USB charging cable. It covers the phone’s Lightning port, however, so you’ll have to remove the bumper if you want to use Lightning headphones or get yourself a pair of wireless ones.

On the back you’ll find a large clicky power button to the left of four LEDs. Pressing the power button once shows how much battery is left. Holding it down will start charging your phone.

Performance and Conclusions

The Atomic Pro’s 3,200mAh battery added 5 hours, 25 minutes of life to the iPhone 7 while streaming full-screen video over LTE at maximum brightness. That’s a great result, significantly surpassing the Juice Pack Air (3 hours, 49 minutes) and Flux Battery Case (2 hours, 14 minutes), and coming close to the 4,000mAh Slim Juicer (5 hours, 48 minutes).

If you’re looking for even better battery life, you’ll need to consider a portable battery pack. The $35.99 Anker PowerCore 10000, for instance, adds nearly an entire day of battery life (23 hours, 44 minutes) for less money than any battery case we’ve reviewed. The trade-off is that it doesn’t provide any protection to your phone at all, and it’s an additional device you have to carry around. But if you need to stay charged all day, it’s a better bet than a battery case.

For $50, the Trianium Atomic Pro it offers a reasonable level of power and protection for your iPhone 7. If you’re looking for more in the way of features, the Mophie Juice Pack Air boasts wireless charging and has a magnetic back for use with compatible mounts, but it has less battery life and costs twice as much as the Atomic Pro. If you want something thinner and lighter, the stylish Flux Battery Case is a good option. And if you simply want the most extra battery life, the ZeroLemon Slim Juicer gets you the most juice for the lowest price.