I just used one of these batts and charger for the first time today in my Phidias. I think I like vaping at 5v as opposed to 6v. But I too was a bit worried when the light never turned green but the batts were reading 5.8v fresh off the charger. Also, they were pretty warm to the touch. I dont think I'll be taking any chances leaving these on the charger while I'm gone.