An electric battery is a device consisting of one or more electrochemical cells with external connections provided to power electrical devices such as smartphones, and electric cars.
Batteries in initial stages had a fluctuating output, so they were not that practical. The first practical battery was invented by John Daniell called Daniell cell. Over the course of time batteries got more compact and more efficient. Nowadays smartphone uses Li-ion batteries.
However, the capacity of these batteries reduces after few hundred charge cycles. As the world is getting advanced in terms of technology the power demands have increased. Apple is slowing down old phones because this reduces the power consumption which in turn reduces the load to the older iPhone batteries. This prevents the phone from getting restarted again and again or other such problem.
Apple gave a solution to the problem:
Apple kicked off the battery replacement programme for the iPhone 6 and later models at a price of Rs. 2,000 excluding taxes, which came to around Rs. 2,600 after adding the taxes. However, support executives at multiple Apple authorized service centers told that the price has been reduced to Rs. 2,000, all inclusive. This helps the user to easily change the battery and get the full benefit of the smartphone without compensating the speed. Also, iOS 11.3 will have a feature that the user will have the freedom to turn off the battery throttling (which leads to slow phone) irrespective of the condition of the battery.
Apple’s CEO Tim Cook’s interview http://abcnews.go.com/Business/apple-make-350b-contribution-us-economy-years/story?id=52405662
“Technology is nothing. What’s important is that you have a faith in people, that they’re basically good and smart, and if you give them tools, they’ll do wonderful things with them.”