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 or 30 or 40 or 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 and 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: ABSandPC 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.