What does a battery tester indicate?

A battery tester primarily indicates how much battery charge is left in a battery. This information is critical for users to determine whether a battery still has sufficient power to operate devices effectively. Knowing the remaining charge allows users to make informed decisions about when to replace or recharge the battery to avoid unexpected failures in device operation.

While other aspects such as charging time or battery capacity may be relevant in different contexts, a standard battery tester is mainly designed to assess the current charge level. This makes it easier for users to monitor battery status and maintain the functionality of batteries in various applications.