This converter support the ability to charge the power tool battery. Product Built-in Battery Lock Fixed Combination Tool Battery. It allows your for Makita to Share Batteries with Cordless Tools, Saving Money. Built-in BMS, discharge overload protection. This Adapter Converts for Makita 18V Slider Lithium Battery to for BOSCH 18V Slider Li-ion Battery With charging function. Warning: 1.The Adapter is Suitable for Makita 18V BL1820/30/40/50 Slider Li-ion Batteries. 2.Please do try to use the adapter with other models of battery. 3.Please Carefully Confirm Your Tools Battery Type !!! 4.The Battery & Tool in the photo is Only for buyers to buy the correct reference. 5.For a long time do use, Please separate from the battery. Colour: black Material: ABS+PC Package Contents: 1 x battery conversion adapter (without batteries) 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.