How to charge phone batteries to maximize life?

Question

ive heard many different things i should do to optimize the life of my iphone lithium battery -- which one is correct?

1) let it die before charging it. if you charge it when it still has life, it will wear down the battery.

2) charge it anytime you need. it wont matter if it still has life, it wont wear down the battery.

i tried to do some research, but it keeps saying the same things.

Answer 1

Theoretically 1 would be the better choice. But as I always point out you still need your phone. You're probably talking about a 1-2 minute different after the battery has been used for about 2 years.

Answer 2

use the phone till it dies, then charge to full capacity then again. over and over and over. even though youve seen it a couple of times, thats the only way to maximize the life of the battery.