Overlander's SD4 Pro Charger is their most compact Lithium and NiMH charger. This simple 50W AC charger is capable of charging at up to 4A. This charger is designed for the user with a smaller voltage range of Lithium and NiMH batteries who do not require a DC input. Features: This charger allows the user to choose a charging current from the available options. These are: 0.5A / 1A / 1.5A / 2A / 2.5A / 3A / 3.5A / 4A. This allows for a wide range of batteries to be charged on this charger at the most suitable charge rate. This charger sports a built in JST-XH balance board. This means that when charging a lithium battery this charger will always.