Improving iphone's battery life

I heard that you can improve it by draining it to 0% and without using it charge it to 100% but that's not working for iphone! Anyone have any advice about improving it?

That is true. It is recommended that you drain it to 0 once per month. Dimming the brightness on the screen will also help. Also you should replace the iphone battery every year to extend the life of the phone, thus giving it more battery life. Hope that helps.

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