If there’s something that stands between foldables and the mainstream smartphone market, it’s their battery life, and Motorola has taken it upon itself to fix that. Almost all smartphone giants have their own book-style foldable available in the U.S., and all of them justify the premium with intricate hinges , flexible displays, and other engineering marvels, but somehow, that doesn’t extend to their batteries. You can unfold a foldable to double its screen size; that’s its entire pitch. But does the battery life also double? Unfortunately, it doesn’t. Among the two widely available book-style foldables in the U.S. — Samsung’s Galaxy Z Fold 7 and Google’s Pixel 10 Pro Fold — the average battery life remains less than that of regular handsets. Motorola But haven’t smartphones already unlocked over 10 hours of screen-on time using silicon-carbon battery technology? This is exactly the gap Motorola is walking into with its first book-style foldable: the Razr Fold.…