I'm not Rob, but Chad (the guy who makes all of these) has said many times just that. The BB and SB are vented through the switch. If you unscrew the top and look at that fiber washer that separates the batter compartment from the switch area you will either see a hole in it or, if it's an older model, a flat spot on the outer diameter. These are to allow venting from the battery compartment to the top where it vents out around/through the switch.