The tech company attributes the decision to aging batteries that don't hold their charges as well as newer batteries. According to a CBS News report, phone processors were pushing the batteries to shut down due to high power demands.
Updates starting with last year's iOS 10.2.1 brought more power management capabilities to the phones, Apple says. But the slow down is only suppose to occur in situations involving cold temperatures, a low battery charge or old batteries.
Watch the CBS News report in the player below
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For those still holding onto those older iPhones, Apple has revealed that they are intentionally underpowering legacy devices.