just some info dump here.
OEM banshees dont have battery's, never have. They power everything off of the stater, the stater has a coil for spark, and one for the light circut. This being said it has to be running for the lights to work, You also need to have a voltage regulator, normally it is mounted to the frame on the back of the subframe, by the CDI box. IF not, the stater can put out too much power when you rev it and blow all the bulbs.
Only time you will see a Bat on a banshee is when someone put a DC conversion kit on, so they can have more power for a LED light bar, or to try some fuel injection stuff etc.