These 6 smartphones have the best battery life

Antonio Villas-Boas/Tech Insider

There are many, many phones out there, but only a few can get you through the day — or even two — on a single charge.

Some phones get great battery life simply because there's a giant battery inside, but certain phones will employ other tricks to keep your phone up and running, like quick-charging, removable battery packs to swap in and out, and efficient operating systems that get the most out of every charge.

If you care about battery life, you'll want to check out these phones.

6. Samsung Galaxy Note 5

The Galaxy Note 5's 3,000mAh battery gives the phone a great battery life, but the phone also features quick charging, which is ideal for making sure you're always charged. 

The Verge said in its review that the Galaxy Note 5 lasted eight hours of continuous website browsing, and it can easily last a day with "real world usage," which is amazing considering its huge, sharp, and bright 5.7-inch screen.

5. Nexus 6P

The Nexus 6P also has a huge battery at 3,450mAh. Google says the 6P lets you have a non-stop conversations on the phone for 23 straight hours. It also uses USB-C for fast charging so a quick 15-minute charge can give you hours of battery life.

Chris Velazco from Engadget said the Nexus 6P had solid battery life in his review. "In day-to-day use, the Nexus 6P routinely lasted through 13-hour workdays with around 30 percent left in the tank," he said, adding that was with "heavy use."

4. iPhone 6s Plus

Numbers aren't everything when it comes to smartphones batteries. The iPhone 6s Plus has a relatively small 2,750mAh battery compared to the others in this list. However, the fact that Apple designed both the hardware and software means the iPhone is very efficient with its power usage. Apple's latest mobile operating system, iOS 9, also introduced Low Power Mode, which activates when your phone's battery reaches 20% and automatically adjusts the software to get the most out of your remaining juice. This function alone can result in an additional 1-2 hours of battery life.

In his review, Trusted Reviews' Evan Kypreos said his iPhone 6s Plus would often have 60% battery life when he left the office after using it "for several hours browsing the internet using 4G [LTE], watching videos on catch-up apps and making calls and texts." My colleague Dave Smith also says he only needs to charge his iPhone 6s Plus once every 1.5 days with regular usage, even with plenty of music streaming and internet browsing.