I don't know why you want to do it, but it's very simple. Set the battery type to Li Ion by repeatedly pushing the "pack type" button (the small right hand one). Then turn the dial until Dschrg Li Ion shows at the top of the display and the two numbers for current and ending voltage are shown below. To change these numbers push the dial until the current number flashes. Turn the dial left or right to change it. Push the dial again until the right number for ending voltage flashes and change it the same way by turning the dial. Push the dial again to stop the flashing. Connect the pack and pushing and hold down the dial until the display says --checking the pack-- and leave it until it beeps at you signaling that it is finished. Read the numbers you want for ending voltage and Mah taken out of the pack.