Final answer:
Responsibility for payment of AED repair parts including batteries generally lies with the owner or manager of the facility that houses the AED unit. They must ensure proper maintenance and readiness for emergencies.
Step-by-step explanation:
The responsibility for payment of required repair parts, including batteries, for Automated External Defibrillators (AEDs), typically falls on the owner or the management of the entity that houses the AED unit. In many cases, this could be an entity such as a school, office building, gym, or government institution. These organizations are usually responsible for maintaining their equipment, which includes ensuring that the AEDs are in good working condition and that batteries and other parts that may expire or need replacement are properly managed. It is important for these entities to budget for regular maintenance and potential parts replacement to ensure these life-saving devices are ready should an emergency arise.