https://www.cnbc.com/2017/12/08/three-iphones-said-to-launch-in-2018-including-one-with-huge-display.html

Apple will launch three new iPhones next year with larger batteries, which should translate to longer battery life for users, according to KGI Securities analyst Ming-Chi Kuo.

Kuo's report suggests the phones will pack high-capacity batteries thanks to new two-cell designs provided by Korean supplier LGC. The new packs reportedly will be "L" shaped rather than rectangular to allow Apple to squeeze as much battery into the iPhone as possible.