Extra box in the battery compartment of my SR

Brain exercise!!!  Asides from it's association with Spice Girls, which is odd, my first inclination was that it's a flasher for turn signals.   Only in envisioning this set up I realized that those things are much smaller. Then I toyed with it being a capacitor in case you needed a spare???!!!  Like, you don't need one of those because you have a battery!

You can tell I got a head of steam going up here!  

BUT, maybe a prior owner liked to operate this bike without a battery to save weight, and then, no one removed it when a battery was installed (simply unplugged the device).

It could have gone bad also.

I briefly thought it could be a relay but it doesn't have enough wires and we don't have anything on our SRs that draw enough power to require a relay (most of us anyway