The battery life of a hidden voice recorder varies depending on the model, the quality of the recording, and the amount of time it is used. Some models may have a battery life of several days or even weeks, while others may only last a few hours. It is important to carefully read the manufacturer’s specifications and reviews to determine the battery life of the hidden voice recorder you are considering.
It is also important to note that the battery life can be affected by various factors, such as the temperature, the quality of the batteries used, and the recording mode. Additionally, some hidden voice recorders come with features like voice activation, which can extend the battery life by only recording when there is sound detected.