Definitely watch the video. What you are doing is converting the milliAMP hour marked on the side of the battery into WATT hours that the chip can measure so it will know how many electrons to push into the battery to fill in completely without over filling. I used the "watt-hour calculator " and entered the 11.27 that it figured. Then I changed my SCREEN tab setting - charging brightness to 40% and charging field 1 to battery charge % uploaded that and waited for the field 2 -usb current to get to .00-.01 no more electrons moving ie full battery at that point I fine tuned the watt hour setting until charging field 1 read 100% capacity. Because each battery is different and I am OCD like that it was showing 97% charged. My final # became 10.88 WATTHOURS I have vaped it down to 3% battery before charging. Sorry for the lengthy lesson