What is low power mode on my iPhone 5s and how do I keep it from going dim?

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what is low power mode on iphone 5 s and how do i keep it from going dim

Keep it from going dim

 

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Re: what is low power mode on iphone 5 s and how do i keep it from going dim

http://www.imore.com/how-quickly-enable-low-power-mode-on-iphone-ipad