For business users, poor battery life is more than just a nuisance: A dead smartphone, tablet or laptop means you can't work when you need to. Speedy performance, high-resolution displays and handy software won't get you far if your device is out of juice.
Good battery life often comes at the expense of good specs, but it doesn't have to. Here are seven powerful mobile devices from 2013 that will keep you working all day long. Bear in mind that all battery-life estimates indicate runtime with continuous use; with average use, expect these devices to last till bed time.
Samsung Galaxy Note 3
The Galaxy Note 3 might just be the best business phone ever made, and its long battery life helps earn it that title. Samsung managed to cram in a big 3,200-mAh battery behind the Note 3's 5.7-inch display, so expect the device to comfortably last through your workday and beyond — about 10 to 11 hours of continuous use. That's no small feat for such a powerhouse handset. In addition to sporting a huge screen, the Note 3 is blazingly fast. Both of those features make the built-in Multi Window feature — which allows you to run two apps side by side — even better. Moreover, the included S Pen stylus is a huge plus for business users.
If you need battery life above all else, this is the smartphone for you. Lasting up to 13 hours of continuous use, the LG G2 outlasts just about every smartphone on the market. The phone pairs great battery life with a roomy 5.2-inch display and a fast quad-core processor. And alongside Samsung, LG is one of the few smartphone makers packing in true multitasking functionality. The G2 QSlide function lets you open multiple apps on the home screen in separate windows. That's a plus for business users who need to juggle tasks such as responding to email while conducting research in a Web browser.
Motorola Moto X
Want a slimmer phone with great battery life? The Moto X is a solid pick, with a battery that can last about 7 hours of continuous use. That's about 45 minutes longer than the smartphone average. It's far from the biggest or fastest smartphone on the market, but it is one of the best for business. It's sleek and portable, with a sharp 4.7-inch display. It also offers a smooth, uncluttered Android experience with productivity-boosting software features like "always on" touchless controls — just say a command to the Moto X, and watch it work, even when the display is turned off.
ASUS Transformer Book T100
This 10.1-inch laptop-tablet hybrid is not a premium device, but small business owners will appreciate its portability, versatility and low price point. They will also appreciate its impressive battery life: about 12 hours of continuous use. The budget-priced laptop-tablet hybrid runs full Windows 8.1, boasts decent specs and ships with a detachable keyboard included. It lacks top-tier hardware and a super-high-res display, but the T100 remains one of the best tech bargains of the year — and one of the longest-lasting.
Kindle Fire HDX 8.9-inch
The 8.9-inch version of Amazon's Kindle Fire HDX boasts seriously long battery life. The device can run for nearly 14 hours of continuous use. On top of that, it packs a fast processor and an excellent display at an affordable price. It's a great bargain but has a few major drawbacks for business users. The tablet was built from the ground up around Amazon's Web ecosystem — a platform fine-tuned for content consumption, not productivity. Users are limited to Amazon's own app store, which covers all the basics but lacks some popular apps such Dropbox, SkyDrive and Google Maps.
Lenovo ThinkPad X240
The Lenovo ThinkPad X240 is a solid business notebook with stunning battery life. Thanks to a hot-swap battery feature, called Power Bridge, the X240 can easily run for more than 17 hours of continuous use. The X240 hardware includes an internal 3-cell battery in addition to a standard battery port at the rear of the chassis, which allows the machine to stay running while you're swapping out batteries. It also features a speedy Intel Core i5 processor, a premium 12.5-inch display and one of the best keyboards on the market.
Apple MacBook Air
The MacBook Air is sleek, powerful and long-lasting. Apple's ultraportable notebook offers nearly 12 hours of continuous use per charge, even without a bulky battery; the machine has one of the slimmest profiles in computing. Business users will appreciate the Air's zippy performance, as well as business-friendly features in the new OSX Mavericks operating system, such as an improved calendar, a new notifications app and a document-tagging feature to keep project files organized.