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The iPhone 7 uses a built-in (non-user-removable) lithium-ion polymer rechargeable battery. It is optimized alongside the device’s hardware and software for everyday usage (talking, internet, video, standby) and designed to deliver better endurance than its predecessor.
Key Specifications Capacity: Approximately 1,960 mAh. Energy: About 7.45 Wh (based on ~3.8 V nominal) in one teardown report. Chemistry & Type: Lithium-ion (Li-Ion) rechargeable, non-removable. Talk time (3G): Up to ~ 14 hours. Standby time: Up to ~ 10 days (~240 hours). Internet use: Up to ~ 12 hours on 3G/LTE, and up to ~ 14 hours on Wi-Fi in some cases.