Check the health of the battery using one of these:
Windows: [http://www.3u.com/|3UTools]
Mac OS X: [http://www.coconut-flavour.com/coconutbattery/|Coconutbattery]
iOS: [https://itunes.apple.com/us/app/battery-life-check-runtimes/id1080930585?mt=8|Battery Life]
If your battery health is close to 80% or lower, consider replacing the battery.
You have a few options on getting a battery replacement, either by:
- Doing it yourself (DIY).
- Taking it to a mobile phone repair shop.
- Taking it to the apple store (booking a genius bar appointment).
Guide to replace the battery:
[guide|19239]
You can buy a replacement battery from iFixit here:
[product|IF124-002-4]