Apple's latest iPhones come with new features and hefty price tags. If you're planning to splurge on a new iPhone, you will want to take good care of it to make it last. Or you can save your money and hold on to your current device and make it last longer. Batteries are the biggest factor in device longevity. Avoid exposing your phone to extreme temperatures, which can damage the battery. Don't let your phone die or charge it to 100%, which can both stress the battery.

Apple on Wednesday unveiled its latest generation of iPhones, including a widely anticipated foldable version called Duo. The company’s new CEO, John Ternus, who took over from Tim Cook on Sept. 1, introduced the latest lineup at the Steve Jobs Theater. After cycling through other updates to the iPhone, the Apple Watch and AirPods along with artificial intelligence advances, Ternus told the audience that “actually there is one more thing,” in a nod to the trademark phrase from Jobs that Jobs himself borrowed from the 1970s detective show “Columbo.” Called Duo, the phone has the “largest display ever on an iPhone, yet fits into your pocket,” Ternus said.

Apple’s new CEO John Ternus takes the helm of the iconic tech giant on Tuesday, ending Tim Cook’s 15-year tenure that saw the company’s value skyrocket to $4.6 trillion thanks to the iPhone’s enormous popularity. The transition to a new CEO comes at a pivotal time for Apple. Artificial intelligence has unleashed the greatest upheaval within the industry since Jobs unveiled the first iPhone in 2007. Apple has gotten off to a rough start in AI after stumbling in its efforts to deliver new features built on the technology, as promised nearly two years ago.