The last thing you want is for your phone to run out of juice when you need it most.
Usually, a phone lasts a full work day with moderate use. But if you use it heavily, you'll need to recharge it more often. Batteries also lose steam over time, running down faster the longer you've owned it. The specter of losing battery -- and therefore losing your communication hub -- is frightening and real.
If you feel your handset battery seems to be stuck in the '90s and doesn't last as long as you'd like, you're not alone. So if long-life battery tops your list of smartphone needs, check out these top-scorers in CNET's continuous video tests.
Editors' note: This post updates frequently. It was originally published October 31, 2011.
We know we said this list includes five phones, but really it's eight. Dominating our roundup with the top three longest lab results is Samsung's entire Galaxy S7 family. That includes the recent Galaxy S7 Active, the S7 Edge and the S7. In addition to being top-tier devices (with the Active being extra durable) they clocked in battery run times over 21, 19 and 16 hours, respectively. Read the full review.
With an affordable price tag of $399 or £309 (approx. AU$590), the third flagship from OnePlus still offers high-end specs like a 16-megapixel camera, a Snapdragon 820 processor and a 5.5-inch display. Its battery also lasts an impressive 14 hours and 17 minutes, and with the company's trademarked Dash charging technology, the device charges super quickly. Read the full review.
Unfortunately available in only China and India, the Mi 5 is one heck of a device. It features a dazzling glass design, a great 16-megapixel camera and a 5.15-inch screen. Its 3,000mAh battery is no slouch either, logging 14 hours in our lab tests. Perhaps by the end of 2017, the West will get a crack at the device? Read the full review.
Sporting a massive 6-inch display, the Mate 8 is an attractive big-screen phone. It has an all-metal build, a fingerprint reader and a massive 4,000mAh battery that continuously played video for 15 and a half hours. Despite its powerful hardware, though, its high price (it starts at €600, or roughly $650 and £450) is a major drawback for those on a tighter budget. Read the full review.
Just in case you thought only premium Samsung handsets can make the list, the Galaxy J3 has a solid battery life and costs less than $200 (or £140 in the UK and AU$329 in Australia). Though it may not be the most powerful device, its removable battery 15 hours and 40 minutes -- giving you enough juice to last the day. Read the full review.