Item Type: Battery Capacity Tester Pattern: 4A, 25W / 5A, 35W (optional) Rated Power Supply Voltage: DC 5.0 – 30.0V (with reverse polarity protection) Rated Load Voltage: DC 1.5 – 25.0V (with reverse polarity protection) Rated Load Current: 0.00 – 4.00A / 0.00 – 5.00A Discharge Power: 25W / 35W Constant Current Accuracy: ±(1% + 3 digits) Voltage Accuracy: ±(0.5% + 1 digit) Overvoltage Protection (OVP): Default 25.2V (user adjustable) Overcurrent Protection (OCP): Default 4.10A / 5.10A (user adjustable) Over Power Protection (OPP): Default 25.5W / 35.5W (user adjustable) Undervoltage Protection (LVP): Default 1.5V (user adjustable) Over Temperature Protection (OTP): Activates at approximately 80°C (non-adjustable) Fan Speed: Oil-bearing intelligent temperature control fan: 580 ±10% RPM; Water pressure bearing intelligent temperature control fan: 8000 ±10% RPM Features: 1. Displays real-time current (A), voltage (V), power (W), capacity (Ah), and discharge time 2. Built-in comprehensive protection mechanisms 3. Automatically records discharge capacity and discharge time 4. Supports setting maximum discharge capacity (OAH) and maximum discharge time (OHP) for unattended testing 5. Intelligent temperature-controlled fan activates when power exceeds 10W or temperature exceeds 40°C 6. Equipped with rotary encoder for precise current adjustment down to 0.01A with current lock function to prevent accidental changes 7. Data grouping function allows accumulation of capacity and runtime from multiple cycles 8. Supports serial communication for data transfer Dimensions: Approximately 44.5 x 10.5 x 39mm / 1.8 x 0.4 x 1.5in, 79 x 25mm / 3.1 x 1in