1. Apple new iPhone 6 Plus :

A fast processor and a big display won't get you very far, if your business phone is always running out of charge. That's why long battery life is crucial for anyone who uses a Smartphone for work.

2. Huawei Ascend Mate 2 :

Battery life: 14 hours and 45 minutes
This huge phone comes with a sizeable battery life to match. The Huawei Ascend Mate 2 lasted an incredible 14 hours and 45 minutes with continuous use. The Ascend Mate 2's battery is so beefy that Huawei even lets you use the phone as a recharging station for your other mobile devices.

3. OnePlus One :

Battery life: 13 hours and 15 minutes
The OnePlus One is a great 5-inch (12.7 cm) business phone with high-end hardware, great software features, and an eye-popping 13 hours and 15 minutes of battery life. OnePlus doesn't have the name recognition of major manufacturers such as Samsung or Apple, but the company's flagship phone has the specs to match up to the Galaxy S5 and iPhone 5s.

4. Google Nexus 6P :

Battery life: 12 hours and 25 minutes
The new Nexus 6P is one of the few smartphones you can buy that runs on Android 6.0 Marshmallow, the latest version of Google's mobile operating system. Since it's a Google Nexus phone, buyers can expect fasterer software updates than you'd get on other devices.

5. Google Nexus 5 :

Battery life: 11 hours and 30 minutes
Google's Nexus 5X packs all the software advantages of its more premium sibling (the Nexus 6P) into a smaller, more affordable package. The Nexus 5X still provides a roomy 5.2-inch display, as well as long battery life, fast performance and a fingerprint scanner for added security.

6. iPhone 6 Plus :

Battery life: 10 hours
Last year's iPhone 6 Plus actually lasts longer on a charge than the newer model, the iPhone 6s Plus. That's because Apple actually slimmed down the battery to make the new phone thinner overall.  Fortunately, the older, longer-lasting iPhone 6 Plus is still available to purchase, and it's still one of the best business phones around.

7. Samsung Galaxy S5 :

Battery life: 9 hours and 42 minutes
Thinking of upgrading to Samsung's latest flagship phone, the Galaxy S6? You might want to think again, if you value longevity. In a quest to make a slimmer Smartphone, Samsung downsized the battery in the newer version, so it dies far quicker than last year's model, the Galaxy S5. Fortunately, the older version is still available to purchase, and still a top-notch work phone with a sharp 5.1-inch display, a fingerprint scanner and even split-screen multitasking. 8. Motorola Droid Turbo :

Battery life: 9 hours and 30 minutes
Motorola claims that its new flagship phone can run for two straight days without a charge; however, with regular use, we found its staying power to be a bit below that. Still, the Droid Turbo's 9 hours and 30 minutes of battery life is pretty impressive for a Smartphone this powerful. It packs a super sharp, 5.2-inch quad-HD display; a blazing-fast quad-core processor; and a whopping 3GB of RAM. And its huge 3,900-mAh battery is the biggest we've seen in a U.S. Smartphone.

9. Samsung Galaxy S6 Edge :

Battery life: 9 hours
Samsung's Galaxy S6 Edge may be a bit more expensive than our overall favorite business Smartphone — the standard Galaxy S6 — but it justifies the steeper price tag with a sleeker design and some nice extras. One such bonus is about an extra half-hour of battery life, for a total of about 9 hours.

Written & Submitted by GIBS B-School Student.