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 adapterColour: blackMaterial: ABS + 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.