Last month, Apple apologised when it was found to be deliberately slowing down a number of its devices.
We had reported that here.
A computer code(software) update will let iPhone owners turn off the “battery saver” feature that slows down some models, Apple has now confirmed.

Apple iPhone 6

The option to turn off off the feature will appear on the iPhone 6, 6 Plus, SE, 6S, 6S Plus, 7 and 7plus models.

Last month, the company faced a lot of barrages for their secretive nature concerning the slowing down of some of it phones.

Customers were angry that Apple had not been upfront concerning its actions before the slowing of phones was discovered....

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http://infocontemporary.com/2018/01/29/slow-down-battery-options-to-be-made-available-for-some-iphones/