I was using my DSO Quad while it is plugged into USB
The charge light was red, when it changed to green, the unit appeared to turn off, the power switch is still in the ON position
I can wake it up by pressing any button, there is no splash screen
This happened at night when it finished charging, but I thought it was off so I never turned off the power switch. This caused the battery to become completely drained next morning. (I turned off my computer so no power came from USB afterwards)
Also after one such charge cycle (charge light was green), I rebooted the device and the battery indicator only showed half full (Vbt was +3.81V). However now the red LED is brighter than before, weird. Rebooting the device again showed battery at 80% and Vbt = +3.97, I don’t know why but it doesn’t seem to update charge levels. The USB cable is plugged in during this time. If it reaches near full charge but I unplug the cable, it drops to about 50% again.