When pulling it off AC power, I noticed my JB3 acts differently if I pull the plug from the wall vs pull the power jack off the unit. If I'm charging and pull the plug from the wall it gets confused and thinks it's still charging when I power it up via the internal batteries. Be sure to pull out the jack from the JB3 first then unplug the AC adapter from the wall.
Another thing to note, don't leave the AC adapter plugged in when not in use,, they eventually will die so the less hours the better.