1. This battery adapter has been tested to work with Makita BL1820 / 30/40 18V lithium batteries; 2. Compatible with dewalt battery: BL1800 series; 3. Made from molds, no 3d printer, robust for welding and assembly; 4. No built-in PCBA protection, so please take care of the battery, no exposure to hot weather; 5. sepc cable: 12AWG, withstand current 18A, the user can be modified according to the actual usage requirements. 6. The battery adapter adopts BMS (battery management system) to provide you with a safer use experience. Specification: Type: battery adapter Colour: black Material: ABS + electrical components Size: 8.4*6.8*2.5cm Package Contents: 2 * battery adaptor Notice: 1. Cannot be used to charge the battery; 2. Cannot be short circuit battery; 3. Disconnect the battery adapter when the battery voltage reaches 15v to avoid excessive battery discharge (prolongs the battery life)