As LightJaguar says, the LED Flashlights section is the WRONG PLACE for this. You've been a member for a year, and you should know your way around by now. Please take more care in future where you post.
The WF-139 have independent charging bays so you can charge one or two at a time and do not have to start or finish two at the same times. I have charged say a 14500 in one side and a 18650 in other or such many times.