Apple's iPhone 18 Pro Max is tipped to feature a larger battery than its predecessor, with the eSIM version reportedly packing a 5,425mAh cell and the physical SIM model a 5,235mAh battery. A previous leak also points to modest battery upgrades for the iPhone 18 Pro. The handset is expected to use Apple's rumoured A20 Pro chip built on a 2nm process. Apple is expected to unveil the iPhone 18 series in September 2026.