How to transfer videos from your PC computer to your iPhone 4?

I downloaded my videos from my iphone 4 to my PC computer. I barely have enough memory on my iPhone with them. If i delete them on my phone, Can i download the pics and vids back from my computer and how would I do that? Also, does more memory used= more battery drain?

A half USB cable should come with almost every phone in the world I should know

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