Teardown reveals iPhone XS has a notched L-shaped battery, iPhone XS Max has an extended logic board with an Apple-designed power management chip (iFixit)

iFixit:
Teardown reveals iPhone XS has a notched L-shaped battery, iPhone XS Max has an extended logic board with an Apple-designed power management chip  —  Tools Featured in this Teardown … Introduction  —  Last year's iPhone X had a weird name and the most advanced internals we'd ever seen in a teardown.

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