We couldn't live without the motion-activated light that's above the back stairs to our apartment. It makes us feel safe when we get home late at night; otherwise, we'd be parking and fumbling with our keys in complete darkness.
How great would it be to have one that charged itself?
This Solar-Powered LED Motion-Activated Light ($79.99) charges during the day (just make sure to install it where the panel receives direct sunlight).
It doesn't need any special installation, doesn't need to be plugged in, and it has the power to light up 300 times each night.
If we ever need to replace ours, we know what to look for.