Main Function: Over charge protection, over discharge protection, short circuit protection, over current protection, reverse charge protection, over heat protectionReplacement: Replace part number for Makita bl1830 bl1840 bl1850 power tool battery.Compatible with: For Makita 14.4V BL1430 BL1440 BL1450 Power Tool Battery.Durable,can use many times will not broken until the battery cells dead.Voltage: 18V Nominal Capacity: 3.0AhColour: greenMaterial: Copper clad laminatePackage Contents:3 * Lithium Battery PCB BoardOnly 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.