Item Type: Battery capacity tester Pattern: 4A, 25W or 5A, 35W (optional) Rated Power Supply Voltage: DC5.0 - 30.0V (with anti-reverse protection, no burning after reverse connection) Rated Load Voltage: DC1.5 - 25.0V (with anti-reverse connection protection, reverse connection does not burn) Rated Load Current: 0.00 - 4.00A or 0.00-5.00A Discharge Power: 25W or 35W Constant Current Accuracy: (1 percent and 3 digit) Voltage Accuracy: (0.5 percent and 1 digit) Overvoltage Protection (OVP): Default 25.2V (can be set by yourself) Overcurrent Protection (OCP): Default 4.10A (can be set by yourself) or default 5.10A (can be set by yourself) Over Power Protection (OPP): Default 25.5W (can be set by yourself) or default 35.5W (can be set by yourself) Undervoltage Protection (LVP): Default 1.5V (can be set by yourself) Over Temperature Protection (OTP): About 80 by default (cannot be set) Fan Speed: Oil-bearing intelligent temperature control fan, speed 580 10 percent RPM or water pressure bearing intelligent temperature control fan, speed 8000 10 percent RPM Function Description: 1. Display current (A) voltage (V) power (W) capacity (Ah) and discharge time 2. With a complete protection mechanism 3. Automatic statistics of discharge capacity and discharge time 4. Set the maximum discharge capacity (OAH) and maximum discharge time (OHP) (Realize unattended power aging test) 5. Intelligent temperature control fan, the fan starts automatically when the power is higher than 10W or the temperature is greater than 40 6. Using rotating encoder potentiometer, the current can be adjusted accurately to 0.01A, and the current can be locked to prevent misoperation 7. Data group function: you can choose whether to add the capacity value and running time of one stage 8. With powerful serial communication function. Size: Approx. 44.5mm or 1.8in, Approx. 10.5mm or 0.4in, Approx. 39mm or 1.5in, Approx. 79mm or 3.1in, Approx. 25mm or 1in Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.