1. This battery adapter has been tested to work with Makita BL1820 or 30 or 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 adapterColour: blackMaterial: ABS and electrical componentsSize: 8.4 x 6.8 x 2.5cmPackage Contents:3 x battery adaptorNotice: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 shooting 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.