Based on early 2026 reports, the iPhone 18 Pro is expected to feature a battery capacity of around 4,000–4,250 mAh, while the iPhone 18 Pro Max is rumored to include a much larger 5,000–5,200 mAh battery. Both devices are likely to be powered by the upcoming Apple A20 Pro chip, which is expected to be manufactured using a 2nm process technology. This next-generation chip could significantly improve power efficiency, allowing Apple to deliver longer battery life without dramatically increasing device size. For the Pro Max model, the larger cell could potentially make it the largest battery ever used in an iPhone.
For the iPhone 18 Pro, battery capacity is estimated to fall between 4,000 mAh and 4,250 mAh. Some supply-chain reports suggest that certain configurations, possibly eSIM-only variants, could allow Apple to slightly increase internal battery space by removing the physical SIM tray, though this remains speculative. Even at this capacity, improvements in chip efficiency and power management could result in noticeable gains in daily battery performance.
The iPhone 18 Pro Max is expected to take a bigger step forward with a 5,000–5,200 mAh battery. A few leaks indicate that the Chinese variant might ship with a 5,000 mAh cell, while global versions could reach as high as 5,200 mAh. Charging capabilities are also rumored to improve, with support for up to 80W wired fast charging and 25W wireless charging, potentially making it one of the fastest-charging iPhones yet.
Overall, these battery upgrades appear to be part of Apple’s broader strategy to extend real-world battery life across its Pro lineup. Combined with the efficiency improvements of the Apple A20 Pro chip, the iPhone 18 Pro Max could reportedly achieve over 40 hours of typical usage, marking a significant leap for endurance in Apple’s flagship smartphones.
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