Features: Charging protection board. Replacement part for BL1830, BL1840, BL1850, and BL1860 power tools. Durable design — reusable until battery cells are depleted. Specifications: Compatible with: 18V BL1830, BL1840, BL1850, BL1860 power tools Type: Charging protection board Voltage: 18V Nominal Capacity: 3.0Ah Battery type: Li-ion Battery configuration: 5S Maximum charging current: ≤12A Overcharge voltage protection: 4.25V Overcharge detection delay time: 2 seconds Over-discharge voltage protection: 14V Charge/discharge over-temperature protection: 100°C Over-temperature protection recovery: 85°C Static power consumption: 20.2V Note: Installation guide not included. Professional installation is recommended. Please verify compatibility before purchase. Product updates may result in minor variations in appearance or color between batches. These differences do not affect functionality. Color: As shown Material: Plastic Package Contents: 1 x Lithium Battery PCB Board Note: Lighting conditions and display settings may cause slight color variation between the image and the actual product. Measurement tolerance: ±1–3 cm.