Battery settings have received a nice overhaul in Android L, as the menu will now predict when your phone will be finished charging when plugged in and how long your charge will last.
The action overflow settings (three stacked dots in the upper right) is where the new Battery saver option is found, a feature many manufactuers add to Android, and we're excited to in stock Android.
Aside from the two aforementioned features, and the obvious visual changes, the battery settings in Android L are very much the same as KitKat.
Now that there is no quick setting for the battery settings, the menu take a bit more work to get to this menu.
And there's still no option to display battery percentage on the menu bar, which is just remarkably dumb.