The Hillman Lithium Smart Battery Charger is a great value replacement charger for 24 Lithium batteries. 3 pin DIN battery connection and supplied with a UK lead for the mains. The smart charger will pre-charge the battery before starting the fast charge, the LED status light will let you know once the battery is fully charged. Even though the smart charger will stop charging once the Lithium Battery is fully charged we do not recommend that the battery is left connected to the charger or the charger plugged into the mains for any period longer than 12 hours,