Battery testing is a crucial process used to evaluate the performance, health, and reliability of a battery. It involves checking key parameters such as voltage, current, capacity, internal resistance, and charge/discharge efficiency. Testing helps determine whether a battery can hold a charge, deliver adequate power, and operate safely under load. Common battery testing methods include load testing, voltage checks, and using specialized battery analyzers. Regular testing is essential for preventing unexpected failures, especially in critical applications like inverters, vehicles, solar systems, and backup power supplies. Proper battery testing ensures optimal performance, extends battery life, and enhances safety by identifying issues like sulfation, cell imbalance, or capacity loss before they lead to complete failure.