If your 78mm manual is already charged it won't try to charge it more. So, sometimes the center battery post on your device(carto/x2 clero) might have been pushed up by over tightening. Or, the battery post on your batt. might have been pushed down. You can use something small like a jeweler's screwdriver to pry up the center post on the device a little OR with the manual ( does it blink with 5 clicks?) OFF, pry up the batt. center post a bit. Either one only takes a little bit of a pry. Got nothin to lose, you've got another on the way!