First time charging an iPhone 4?

Bought it today! And i love it!

just wondering how should i charge it for the first time?
do i let it drain completely or charge it to 100%? And do you guys have any tips how to make the battery last longer between charges?

Let it die completely then charge it to 100 percent without unplugging it then everytime you charge it from now on make sure you charge it to 100 percent and don't unplug it till its charged and turn it off and back on every couple days

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