IPhone 5 dies way before it should?

Okay so back in October my phone would die on 20% in January it started dying on 40%… Now its May and my phone never gets past 68%! I took it to the apple store and they told me that the battery showed it was green meaning it was in good condition. Two days ago it reached 20% and gave me the 20% warning and then died and right now it is on 35%. Any suggestions on fixing this problem?

Can I use iPhone 3G if wi-fi isn't working?

Well my iPhone's Wi-Fi got broken or something and is now greyed out. I'm going to fix it later but for now I want to use my 3G and was wondering if it would work. Maybe they're two completely unrelated things and are able to work on their own, I don't know.

Can the other iphone get this?

I wanted ask that I have an iphone 5 and the email on this iPhone is the the email same on the other phone. So whatever I search here in Safari will it be shown in that phone or email. Because my uncles iMessage comes in my iphone?

Why did he keep staring at me?

Last night, I was taking the tram home, and this extremely young guy (about 20) was also there at the tram stop. I walked past him, but not too far ahead and then just faced the tram tracks, waiting for the tram to arrive. But through my side vision, I noticed he seemed to be glancing at me, and every time I looked in his direction, he'd look away.

Then the tram came and he sat a few rows behind me, was an empty tram. I listened to music on my iPhone, trying to wonder why he was staring at me… Then finally when my stop arrived, I got up, walked to the back door of the tram, and as I was waiting for the tram to stop, I noticed through my side vision again he was actually turning around, looking in my direction. I couldn't help it anymore, I just looked back at him, and he WAS looking at me, straight in the eye! He had a slight smile. When i got off, I was just thinking wtf did he keep looking at me…

some background info is that i'm 17, and girls often describe me as cute.

Added (1). yeah, i'm a guy. :/

Why does my iPhone 5s say I'm almost out of storage?

I've only bad my phone for about five months and it already says I'm almost out of storage. I have the 16gb iPhone 5s.
I only have 700 photos, 13 videos, 301 photos, and not even two full pages of apps. I don't plug my phone into a computer very often, so could that be the problem?

Is secure to buy from this website?

http://www.electronics9996.com/index.asp

This website offer good stuff for a really low price so I'm not sure if I should buy from them because a ps4 is 54$ and the iPhone 5s is 49$. Do you recommend me to buy stuff from them?

Does this sound like a fair trade?

I had an iPhone 4 yesterday that I have had since it came out, and it has been totally destroyed with cracks so I decided I'd go to my daddy's pawn shop and pick out a new phone. I found a super nice iPhone 5C, blue, 16gb almost brand new. Only thing is I have AT&T and this phone was sprint. So I post on my Facebook that I'd be willing to trade. Someone replied and said they would trade their 16gb iPhone 5 for my 5C. His is in good condition.
Is this a fair trade?