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The iPhone 6 Plus battery is a built-in lithium rechargeable cell that powers the device. Because it uses lithium ion (or a variant) technology, it offers higher energy density compared to older battery types — meaning more capacity in a smaller, lighter package
Capacity ~2,915 mAh Watt-hours ~11.1 Wh Voltage (nominal) ~3.8 V (typical lithium cell) Chemistry Lithium-ion / Li-polymer Removability Non-user-removable Talk time (3G) Up to ~24 hours Standby time Up to ~384 hours (~16 days) Internet use Up to ~12 hours (varies)