Which of the following indicates a possible need for a new ELT battery?

The indication that there may be a need for a new ELT (Emergency Locator Transmitter) battery is linked to the usage of the transmitter. When a transmitter has been used for more than one cumulative hour, it generally signifies that the battery might be nearing the end of its operational life. ELTs are equipped with batteries that have a limited duration for which they can remain effective, typically around one hour of cumulative transmission time, depending on the model.

Once that hour is exceeded, the battery's ability to perform reliably diminishes, leading to potentially compromised functionality when it is most needed during emergencies. Therefore, recognizing this usage threshold is crucial for ensuring that the ELT remains operational and effective.

While the illuminated red indicator light, weak signal production, or beeping noises might also suggest issues with the device, they do not directly indicate a battery's need for replacement in the same definitive manner as the usage time does. These other signs could point to various malfunctions or configurations that may require different troubleshooting steps rather than an immediate battery replacement.