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The iPhone 8 features a built-in, non-user-removable lithium-ion rechargeable battery. Though its rated capacity is smaller than the previous model, Apple uses more power-efficient internal components (such as the A11 Bionic chip) so that real-world battery life remains comparable. It supports fast charging (with compatible adapter) and wireless charging via Qi standard.
Key Specifications Capacity: ~ 1,821 mAh. Approximate energy: ~ 6.96 Wh (based on battery voltage and capacity from some sources) Chemistry & Type: Lithium-ion (Li-Ion), non-removable. Talk time (wireless): Up to ~ 14 hours. Internet use: Up to ~ 12 hours (according to Apple spec) Video playback: Up to ~ 13 hours (wireless) according to Apple specs. Audio playback (wireless): Up to ~ 40 hours. Charging features: Fast-charge capable: up to 50% charge in ~30 minutes with 18 W or higher adapter (sold separately). Wireless charging (Qi standard) is supported.