Even though it is designed to help in a power outage, it also works as a perfect around-the-house flashlight. It is especially useful that you can set it down and bend the light to wherever you need it, and keeps your hands free. The base makes recharging easy and leaves the flashlight always ready to use, no need to mess with batteries.
It's also cheap and very easy to make!
How it works:
A wall-wart transformer is constantly plugged in and connected to the base. A PNP transistor has its base connected to the power in from the wall, and the voltage from that turns the transistor off. When it stops getting external power, the transistor is turned on and sends power through a connector to the flashlight. This turns on the flashlight's high power LED on a low power, letting out plenty of light to find your way but conserving the batteries. If the button on the flashlight is pressed, it goes to full power.
Now let's get started!