Reddit users have noticed that Apple appears to be slowing down old iPhones that have low-capacity batteries. While many iPhone users have experienced perceived slowdowns due to iOS updates over the years, it appears that there’s now proof Apple is throttling processor speeds when a battery capacity deteriorates over time.
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UPDATE!!! – Dec 28, 2017
Apple’s apology to the customers
UPDATE!!! – Jan 3, 2018
Apple’s battery replacement for iPhones in INDIA :