A: Here’s an instance where a dead battery is worse than no battery at all. The BBE 4000XL comes with a 9-volt battery already installed inside for use on systems without phantom power. If you are using phantom power to operate this device, a dead 9-volt battery (a result of natural draining over 6-12 months) will prevent the phantom power source from going through the unit. The solution is to simply remove the battery and not replace it. Then phantom power will power the unit correctly.