Disable "unplug charger" notification on Docomo Xperia A SO-04E

Every time the Xperia A is unplugged from a charger, an ecologically conscience and thoroughly annoying notification pops up, reminding you to "unplug from socket to save energy".

To make it stop, go to Settings > apps > all, rotate your phone to landscape mode so that longer names are fully displayed, and scroll down to com.sonyericsson.unplugchargerreminder. 

Either disable it outright or just uncheck the "shown notifications" option, and of course don't forget to unplug your chargers from the wall.