A trickle charger, also known as a battery maintainer, is a device designed to slowly charge a battery over an extended period of time. Unlike regular battery chargers, which deliver a higher charging current to quickly charge a battery, a trickle charger provides a low, constant current to keep a battery at its full charge level without overcharging it.

Trickle chargers are commonly used for vehicles and equipment that may sit idle for extended periods, such as motorcycles, classic cars, boats, RVs, lawnmowers, and other seasonal or infrequently used vehicles. They help prevent the natural self-discharge of the battery and ensure that it's ready to go when needed.

Using a trickle charger can help prolong the lifespan of a battery and ensure it's always in good condition when you need it. Always follow the manufacturer's instructions and safety precautions when using any type of battery charger or maintainer.