The heart does not need to have electrical activity for defibrillation work?

This statement is false. For defibrillation to be successful, there needs to be some electrical activity in the heart. Defibrillation works by delivering a high-energy electrical shock to the heart to stop all electrical activity and allow the heart's natural pacemaker to take over. If there is no electrical activity in the heart, defibrillation will not work.