Replacement BL1850B/BL1840B battery protections board. Suitable for BL18V tool lithium battery housing DIY. Craft from quality materials, reliable and easy installation. Accurate design, perfectly fit. Only the protective board and do not include batteries or casing materials. Specifications: Applicable Model: for 18V Tool BL1850B/BL1840B Lithium Battery DIY Colour:green Material:Metal + Plastic Due to different batches, there may be differences in product appearance and printed text, which will not affect use Package Contents: 1 * Protective Circuit Board Only the above package content, other products are not included. Note: Light reflection 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.