Item Type: Battery capacity tester Pattern: 4A, 25W / 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 / 0.00-5.00A Discharge Power: 25W / 35W Constant Current Accuracy: (1% + 3 digit) Voltage Accuracy: (0.5% + 1 digit) Overvoltage Protection (OVP): Default 25.2V (can be set by yourself) Overcurrent Protection (OCP): Default 4.10A (can be set by yourself) / default 5.10A (can be set by yourself) Over Power Protection (OPP): Default 25.5W (can be set by yourself) / 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% RPM / water pressure bearing intelligent temperature control fan, speed 8000 10% 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 / 1.8in, Approx. 10.5mm / 0.4in, Approx. 39mm / 1.5in, Approx. 79mm / 3.1in, Approx. 25mm / 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.