Sorry for the newb sounding thread, but I have not dealt with the ultrafire 18650 batteries I bought to run in my M1X. I bought an ultrafire 3.7 volt charger to use. My question is, since there is no instructions whatsovever with the charger, how long will it take to charge both cells? There is an indicator light for each cell that switches to red once the battery is in place. It is green when there are no batteries inserted.