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Short description: The iPhone 7 Plus uses a built-in (non-user-removable) lithium-ion rechargeable battery. It is designed for everyday smartphone usage—calls, web, video playback—and benefits from efficiency improvements in both hardware and software for longer real-world use.
Key specifications: Capacity: approximately 2,900 mAh (≈11.1 Wh) at ~3.82 V nominal. Battery type: Lithium‐ion / lithium‐polymer rechargeable, built‐in (non-removable). Talk time (3G): Up to ~ 21 hours. Standby time: Up to ~ 16 days (≈384 hours). Internet use (typical): Up to ~ 13 hours on 3G/LTE or Wi-Fi.