If you Google this the BBU will not silence while the battery is dead. The only way is to replace it. The battery only keeps the phone services online, it'll disconnect everything else - internet/tv - when the power goes out. Don't have phone service, Verizon doesn't care, it'll still beep until you buy a new battery, which according to their website is your responsibility to replace. If you have an old enough system you can trick it by swapping two wires, if it's a newer installation within the past couple of years you are out of luck, the battery is about $30 on Amazon, about $60 the last time I checked in Verizon's web store. There is no defect as far as Verizon is concerned, the system is working as designed to notify you that your (non-existant) phone service isn't working.