Why does my iPhone battery die so fast? I have iOS7?

I have an iPhone 4S with iOS7 and I'm not sure if the other questions that have been asked have this iOS. I have done a lot of the things that the everyone has been saying with the new operating system as far as turning of the background refresh, turning off Wi-Fi and location services as much as possible, turning down the brightness as much as possible, no bluetooth, mail does not push, only fetch every hour, and I close applications as much as possible. Has anyone dealing with this problem ran into a solution that articles haven't said yet or know of anything to try. I have done everything, but upgrade my phone

How to downgrade from ios 7? - 2

I installed ios 7 for my dads iphone 4 and he hates it! Is there any way I can downgrade him back to any earlier version of ios if I have SHSHs from my iphone 4 for ios 4.3.5 and 5.1.1?

I message isn't working after ios 7?

I have an iphone 5 and I updated it to ios 7 iMessage was working fine before but now it's not working. It's on in settings but it says waiting for activation so I put my password in for my Apple ID to sign into iMessage but it just loads for ages then says check your network connection and I've tried it on Wi-Fi and 3G.

My iphone 4 home button won't work? - 1

My phone has been taken very well care of I haven't dropped it and its never had water damage and today out of no where the home button just stopped working. This is ridiculous. Is there any way I can fix this that doesn't cost money because I shouldn't have to pay money for this. Will apple fix it for free?

Does rechargeable iPhone 5 work when you have ios 7?

I have an iPhone 5 and just download ios 7 last week, but I'm wanting to buy a rechargeable phone cover but I've been told they don't work when you have ios 7 installed. Is this true?!
** already downloaded ios 7**

IPhone 4 won't charge even after bat.replace?

I have a iP4 and had an issue, that the battery wouldnt charge. There was this lightning symbol. Now I bought a new battery and it didn't fix the problem. As long as the battery was charged the phone worked, but now it is at the lightning symbol again. Any idea?

All the obvious stuff like testing with another cable/charger/port was done. My question is should the dock connector or rather the logic board be replaced next? Where are the charging electronics placed?