IPhone 5 battery draining really fast?

I've had my iphone 5 for a couple weeks and the battery was just fine but a couple days ago it started draining really fast. About 1% every ten minutes In standby mode without any apps running in the background. Is there any way to fix the battery? How fast do most iphone 5 batteries drain?

I'm having the SAME issue. My i5's battery drops 10-20% on standby fully charged. While I'm using it, it drains about a % a minute. Most in general it should take your iPhone 8-10 (or even more) hours to completely drain. 225 hours of standby, 10 hours of web surfing and music streaming, 8 hours of video watching. That's the functionality the i5 is suppose to have. Mines lasts 5-6 hours. My advice is restore your phone, and If that doesn't work, take it to the Apple Store. Please bring proof when you go, (i.e. Screen Shots etc.)

The issue seem to be some settings are corrupted,. I don't think anybody knows at this point extactly which ones, but the common suspects are those related to data communications.

The solution is to reset these settings to default. This is particularly important for people who restored their previous backup into an iPhone 5 using iTunes, These backups could be from previous models like an Iphone 4S which may have incompatible settings with those of the IPhone 5.

So the gist of it is to
A) Backup your data
B) Reset the Iphone 5 settings
C) Put your data back into the Iphone 5.

To do so
1) Connect iphone 5 to itune, do a backup of your current settings + data
2a) From iphone settings-> icloud and turn on those type of data you want to push to icloud, example Mail/Contacts etc.
2b) Backup your data from Apps that are not icloud friendly. How to do so depends on the individual apps. For example WhatsApp chat history.

When you are sure these data are safely in the cloud then
3) On iphone go settings->general->reset-erase all data and settings. When iPhone came back alive, choose setup as new phone, activate and enter the usual setup questions like language and location.
4) Connect iphone to iTunes and choose setup as NEW phone. NEVER do any restore…
5) Wait for your iCloud to push the data back into your iphone 5, for other Apps, put the data back into the iphone as per individual apps instructions…

Then from that point onward, you may notice that the battery is back to normal and there's some speed gain in your 3G or 4G speed because the data communications settings are not corrupted

If this idea didn't work at all then you still can restore your phone right to where you took step 1 and then it's time to google for other ideas.