I just finished a little project that adds storage to my battery compartment. Originally got the idea from Flyswatter.
After taking careful measurements it's designed so that it can't fall into the battery compartment even while removal. Lid still closes perfectly fine and switch and lock latch works with no modification to either. Drain holes in the corner should water ever get in it. Made from aluminum and powder coated with a pebble finish. This will be a perfect space for my tools. I still need to place a piece of rubber mat on the bottom. Any ideas where to buy that texured rubber mat you see on boat trailers and step pads?