The protection board has stable working performance and long service life.The item can be used many times will not broken until the battery cells dead.It has over charge protection, over discharge protection, short circuit protection, over current protection, reverse charge protection, over heat protection.Item Name: Battery Protection BoardVoltage: 18VFeatures: Practical, Durable, Fine Workmanshipfor Can replace 18V series models: BL1830, BL1840, BL1850, BL1860, 194205-3, 194309-1, LXT400Material:pcbcolour:bluePackage Contents:1 * Protection BoardOnly the above package content, other products are not included.Note: Light 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.