Among the listed, which system is NOT typically considered a source for standpipe and sprinkler systems?

Standpipe and sprinkler systems in buildings are designed to manage and deliver water for fire suppression. Various sources can supply water to these systems, ensuring they function effectively during an emergency.

Gravity tanks are elevated reservoirs that utilize gravity to provide a steady flow of water, making them a common source for these systems. Pressure tanks are specifically designed to maintain water pressure in a system, which is crucial for the timely delivery of water through standpipes and sprinklers. Fire pumps are vital components that increase water pressure, especially in high-rise buildings, and they ensure that the system can deliver water even when municipal supplies are insufficient.

Batteries, on the other hand, do not supply water. They are used in systems to power alarms and other electrical components but do not provide the necessary water needed for fire suppression systems. Therefore, the correct identification of a source that is not typically involved in the supply for standpipe and sprinkler systems is batteries.