I have my new/first quad. Seems like forever, but I have one. Ordered the week before fathers day as a gift for me.
I got the red light when I plugged it in yesterday and charged it over night (instructions said 1 hour or more and make sure red wire is closest to the edge). Got up this morning to calibrate it and it will not turn on. Plugged back in the USB and turned it on and it seems to work fine.
Any ideas on how to fix it? Maybe a way to test the battery and charger? When I leave it on the USB and leave it, it eventually goes off and the LED turns green. But it seems it is not charging.
The positive/red is on the bottom pin close to the edge of the unit.