Battery on my iPhone 4S doesn't fully drain?

My battery life is weird instead of draining all the way down to 1% it dies at around 12%? What can I do to change this? Or improve battery life overall?

Try different battery apps they have some good tips and guidelines

First off: You should NEVER fully drain your iPhone's battery it's not designed to be fully drained (a safety measure implemented in the battery's construction to prevent damage to the internal components that allow the battery to hold a charge)

You can charge it when it's as low as 12% but ideally you shouldn't allow your battery to always get that low because it can damage the battery's ability to hold a complete charge and need to be replaced sooner.

  • Why does my iPhone battery drain so quick? I took my phone off the charger at about 9:30am, it's now 10:01am and it was on 100%, I hardly used it, I only went on Facebook to check the newsfeed and reply to an inbox and now it's on 87%? I was watching it go down and it goes down 1% roughly every 2 minutes. It's been happening for about a week now and I'm lucky if my phone lasts me half a day. What can I do (WITHOUT BUYING A NEW PHONE)
  • Why does my iPhone 5 drain battery even when I don't use it? My battery keep running out even when I don't use it. I tried to turn off location services and brightness and stuff but doesn't really help. What should I do?
  • Why does my iPhone 5 battery drain fast? Ok, so, I charge my iPhone up to 100% battery, It's on the night, so I don't use it, I just unplug the iPhone after it's charged, and put it on my table, the next day in the morning, it drains to 98% or even less, I already turned off all the things that drain the battery, IOS 7.3 by the way. And umm, I turned off the parallex, app refresh, lower brightness, pretty much everything off/disabled, even Siri, Why does this happen?
  • Should i let my Iphone battery drain to 0%? My i phone battery last so much. If i charge at morning and check it at night the battery life is still (90-79%) but is it also ok to let my iphone batter drain till o% some of my friend told me its good to do that.