Detail: 1. Built-in dual ICs detect the voltage of each battery and track usage cycles. 2. Each battery is individually detected and protected with features including overheating protection, overvoltage protection, undervoltage protection, overcurrent protection, and overload protection. 3. Designed for new series models with low-voltage shutdown functionality. Compatible with various power tool systems. 4. Offers stable performance and shock resistance, making it ideal for use with torque wrenches, impact drills, and angle grinders. 5. Compatible with BL1850B/BL1840B lithium battery packs. Specifications: - High discharge rate: 15A - Maximum discharge current: continuous 60A, pulse - Discharge termination voltage: 13.75V - Overcharge protection voltage: single cell 4.25V ± 0.025V - Overcharge protection recovery voltage: 4.1V ± 0.025V - Over-discharge protection voltage: single cell 2.7V ± 0.08V - Over-discharge protection recovery voltage: single cell 3.0V ± 0.08V - High temperature charging protection: >60°C ± 2°C - Discharge overcurrent protection 1: 100A with 1-second delay - Discharge overcurrent protection 2: 180A with 100ms delay - Short circuit protection: 200A Preparation before assembly: 1. When using new batteries, please note: A. Use power lithium batteries only. B. A set of six iron cores must be equipped with resistors and capacitors to balance cell voltages. 2. When repairing old batteries, test the voltage of each cell. If voltages differ, charge each cell to the same voltage level. Very important: Before soldering the PCB, ensure all battery cells have equal voltage. Note: Slight color variations or marking differences may occur due to lighting and display settings, but these do not affect functionality. Material: Plastic Color: Green Package Contents: 1 x PCB circuit board (PCB board only, other accessories not included) Note: Light reflection and different displays may cause slight color differences between the image and the actual item. Measurement error is +/- 1-3cm.