(Image credit: Sanuj Bhatia / Tom's Guide) When it comes to smartphones, we're basically living in two different worlds right now. On one side, you have brands like Samsung and Apple still sticking with lithium-ion batteries, while on the other, companies like Oppo, and Xiaomi have moved to silicon-carbon battery tech. This change means that silicon-carbon batteries on these newer flagships are often around 25-35% larger than what traditional lithium-ion phones offer. Yet, brands like Apple and Samsung still claim "all-day battery life" in their presentations. Article continues below Hardware and specs (Image credit: Tom's Guide) Before we get into the test results, let's quickly go through the hardware and internal specs of these phones. While Apple doesn't officially publish battery capacities of the iPhones, credible reports suggest the iPhone 17 Pro Max packs an estimated 4,823mAh battery on models with a SIM tray, while the U.S. eSIM-only version is said to feature a larger 5,088mAh cell.…