Switch to Airplane Mode
Generally, the less background activity that your iPhone is preoccupied with, the faster it will charge. If your phone isn’t using its battery for tasks, the charge simply builds up faster, no matter what charging system you may be using. So pop into your Control Panel and hit the Airplane Mode button to turn off connections and help your phone, well, relax. Of course you could also turn your phone off entirely, but this takes longer and leaves you without access to your alerts and messages, which can be a painful experience.