An intelligent battery tester can indicate what about a battery?

An intelligent battery tester is designed to provide insights into the battery's performance and condition. Among its capabilities, indicating the capacity left in a battery is particularly valuable because this measurement reflects how much energy the battery can store and provide under load. Knowing the remaining capacity is crucial for assessing whether a battery can fulfill the demands of the device it powers.

While voltage level, temperature, and resistance can also be important parameters of a battery's health, they do not directly indicate how much usable energy remains available. Voltage levels can fluctuate with charge and load but do not provide a direct measure of capacity. Temperature can affect performance and longevity but does not quantify energy storage. Resistance can help identify degradation or issues within the battery but again does not translate into a clear indication of how much energy is left. Thus, capacity left stands out as the most critical indicator when evaluating the overall state of a battery.