iPad doesn't charge when plugged into my computer
When I plug my iPad into my computer it says 'not charging'. Why?
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Many computer USB ports are limited in the current that they can supply.
Unless explicitly designed for charging, most computer USB ports can only provide 0.5A @5V (i.e., 2.5W) or 1.0A @5V (5W). The majority of iPad models require at least 2.4A @5V (12W) to reliably charge.