The Clever Engineering Behind the New iPhone XS Battery

THE OVERWHELMING THEME of iPhone XS reviews? That Apple's latest flagship smartphone doesn't differ much from last year's iPhone X. It looks and works about the same, and still costs a bundle. But those similarities belie one very important difference, an Apple innovation that hides beneath the surface: a battery with a most unlikely shape.
The iPhone X, as well as this year's iPhone XS Max, both, rely on a dual-cell battery for power. That is to say, they essentially use two rectangular lithium-ion units, placed perpendicular to each other, to keep those smartphones humming. Together, they form the shape of an L, snuggled up inside your phone.