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The iPhone 8 Plus uses a built-in, non-user-removable lithium-ion rechargeable battery. Apple paired this battery with more power-efficient hardware (notably the A11 Bionic chip) and enabled features such as fast charging and wireless (Qi) charging. Despite a slightly lower capacity than its predecessor, the real-world battery-life is designed to be comparable.
Key Specifications Capacity: ~ 2,691 mAh (some sources list ~2,675 mAh) Energy: ~ 10.28 Wh (based on teardown data: 3.82 V, ~2,691 mAh) Chemistry/Type: Li-Ion (Lithium-Ion) polymer rechargeable, non-removable. Talk time (wireless): Up to ~ 21 hours. Internet use: Up to ~ 13 hours. Video playback (wireless): Up to ~ 14 hours. Audio playback (wireless): Up to ~ 60 hours.