BOOST Mode If a vehicle fails to get started in the Jump Start mode, it may be because the voltage between the jump start clamps is lower than 3V. You can try the BOOST mode. IMPORTANT: It is never allowed to directly connect the positive jump start clamp to the negative one in the BOOST mode. Otherwise, there will be a strong current that may cause damage, injury or even death. The operation in the BOOST mode is similar to that in the Jump Start mode. The only difference is that you need to select the icon as the working mode. Note: V4500 Plus will output for 3 minutes in the BOOST mode. After that, you can press and hold the button for 7 seconds to power off V4500 Plus.
Or you can press the button to change to another mode to stop the BOOST output. M 4.3 Testing a Battery Note: V4500 Plus can only be used to test 12V lead-acid batteries. 12