Poor Performance at Low Battery I'm having an issue where my phone gets sluggish and non-responsive when the battery level gets to around 35% or less.  Apps will freeze, it will take the keyboard a long time to appear, and the unlock pattern will sometimes not show up at all when turning the screen on.  Any ideas would be appreciated.

Phone - Galaxy S3

Carrier - Sprint

Android version - 4.3
I guess you are using stock Samsung firmware. If so, probably you enabled Samsung's "power saving mode".

Go to "power saving mode" settings and unchecked "CPU power saving" options.