Features: Engineered with double IC for precise voltages monitoring and multi layered protections (overheating, overvoltage, undervoltage) With optimal safety and extended life for 18V BL1850B/BL1840B batteries. Featuring a high 15A discharge rate, 60A continuous current tolerance, and advanced safeguards against short circuits, maintaining stable performances. Perfect for construction site or repair workshops, the board's low voltages shutdown mechanism prevents battery damage during extended operating. Direct replacement for BL1850B/BL1840B packs, this green PCB requires cell voltages synchronization before installation to ensuring seamlessly compatibility with 18V battery systems. Specifications: For BL1850B/BL1840B Battery Protector Circuit Board High discharge: 15A MDischarge current: continuous 60A Discharge termination voltages: 13.75V Overcharge protections voltages: Single battery 4.25v 0.025v Overcharge protections recovery voltages: 4.1V 0.025v Overdischarge protections voltages: single cell 2.7V 0.08v Overdischarge protections recovery voltages: single cell 3V 0.08v Discharge overcurrent protections 1: ≥100A/1s delay protections Discharge overcurrent protections 2: ≥180A/100ms delay protections Board size about 11.2cm/4.41in Package Includes: 1PC 18V Battery Charging protections board circuit board note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.