1. This battery adapter has been tested to work with BL1820 / 30/40 18V lithium batteries; 2. Compatible with battery: BL1800 series; 3. Made from molds, no 3d printer, robust for welding and assembly; 4. No built-in PCBA protection, so please of the battery, no exposure to hot weather; 5. cable: 12AWG, withstand current 18A, the user can be modified according to the actual usage requirements. 6. The battery adapter adopts (battery management system) to provide you with a use experience. Specification: Type: battery adapter Colour: black Material: ABS + electrical components Size: 8.4 x 6.8 x 2.5cm Package Contents: 3 x 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) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.