It has a small amount of intelligence (turns on when dark off when light) but not enough! Time for some upgrades. :D
First, the batteries. The control box houses the batteries, which are three Ni-MH AA cells. They are 600mAh. (That's not a typo - six hundred). I swapped them out for three 1500mAh Ni-MH cells that I don't use anymore (because they are only 1500mAh).
Then I reverse engineered the circuit diagram for the electronics (nothing special there, two transistors, two resistors a switch and a diode).
I have a few ideas for sensors and transducers I want to add to the light, but I'll start by adding a microcontroller. Step forward the Arduino Wee made by SparkFun Electronics.