With 4-stage battery fuel gauge; accordingly, the remaining battery capacity can be checked without having to install it in an LXT battery tool. The battery terminal has been modified to improve durability. Equipped with a battery protection circuit designed to protect the battery from damage caused by deep discharge, high temperatures or overload current. Compatible with 18 V battery tools with an asterisk on the battery terminal unit or with a yellow terminal. Transport regulations: subject to class 9 of the "United Nations Transport Regulations", as the energy capacity is over 100 Wh. The other functions are as for the BL1850B model: Digital communication between battery and charger. Cooling system for maximum battery life. Compatible with battery tester. Note: The DC24WA charger is not compatible with this model.