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The iPhone 11 Pro Max has a 3,969 mAh built-in rechargeable lithium-ion battery that provides up to 5 hours more battery life than the iPhone XS Max. It supports fast-charge capabilities, achieving up to 50% charge in about 30 minutes with an 18W or higher adapter, and also has wireless charging support for Qi chargers.
The iPhone 11 Pro Max battery has dimensions of 15.04 Wh capacity, with a voltage of 3.79 V and a milliamp-hour (mAh) rating of 3,969 mAh. Specific length, width, and height measurements are not publicly available from Apple as the battery is not designed to be user-replaceable, but replacement parts often list their own dimensions, like the one listed by click