Microsoft Sculpt Ergonomic Desktop Wireless Keyboard Batteries are self-draining / get empty very fast

I have a Microsoft Sculpt Ergonomic Desktop Wireless Keyboard and recognized, that the batteries get empty much faster than say in the technical data sheet. According to the manual they are supposed to stand "36 month typical".

How-I-fixed-it:
I'm travelling a lot with the keyboard in the backpack. In case a key on the keyboard is pressed while in the backpack the whole time, it seems to keep trying to send this event to the receiver, even if the receiver is not plugged into the computer's USB port. So it's constantly sending and emptying the batteries.

In this case either remove the batteries before putting it into the backpack or find a case to avoid the keys being pressed.

Nokia Lumia 920 WindowsPhone 8 WP8 Battery drain because of background tasks

Over the last days, the battery of my Lumia 920 was empty much faster than i was used to. Usually it lasted y couple of days, but now it's empty after 1 day.

How-i-fixed-it:
I found the right hints here: http://answers.microsoft.com/en-us/winphone/forum/wp8-wpupdate/lumia-920-battery-issues/94655503-118c-4dfe-b433-08c23b8140c6

I fixed it by disabled a couple of background tasks. I also found out, that some of those Background tasks were added by recently installed apps.

Go to Settings->Apps->Background Tasks to see the list of apps that work in the background and choose the ones the disable.

Auf Deutsch:
Der Akku meines Nokia Lumia 920 wird schnell leer aufgrund von aktiven Hintergrundanwendungen.