IPhone 5S, does this actually work?

So I used to have an iPhone 4S, but the battery was extremely bad. I think I might have damaged it somehow, cause it wasn't like this to start with, but it would die even if I had 70% left, and the battery dropped extremely quickly. I had it for about a year and a half, so yesterday I got the iPhone 5S.

The woman at the store said that I could make the battery 3 times better by only using it till I had 80% left and then charging it till 100% again for two weeks, so only use it down to 80%. Now, does this actually work? Cause it's really a pain, I can't go anywhere without having to turn it off after a while even though there's 80% left.

Please only answer if you have experience with this sort of thing, thank you!

Yes why not

No, I think thats stupid.

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