A trickle charger is a type of battery charger designed to provide a low, steady charge to a battery over an extended period. It is often used to maintain the charge of lead-acid batteries in vehicles, motorcycles, and other equipment, ensuring they remain ready for use without overcharging. These chargers are particularly useful for batteries that are not frequently used, as they help prevent sulfation and extend battery life. By delivering a small amount of current, a trickle charger keeps the battery topped off without causing damage, making it an essential tool for battery maintenance.