Teardown reveals how much capacity Apple's $99 MagSafe Battery Pack has

The video also identifies various other internal components.

Apple MagSafe Battery Pack review

Apple's MagSafe Battery Pack: Everything You Need to Know - MacRumors

Apple MagSafe Battery Pack Review

Teardown of Apple's MagSafe Battery Pack reveals two charging coils

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MagSafe Battery Pack Teardown Reveals Power Capacity, Two Identical Batteries, More Details