I have used 30Q for vaping and never had a problem but on batteries it’s stamped do not use for vaping or ecig device. I got VTC4 from same place and they aren’t stamped don’t use for vaping. I just double checked my devices with older Q30 and I never had any problems with them. Old 30Q are SDI 136 and new ones are SDI 141 . Is there any reason why they would stamp Q30’s not for vaping? Specs say 3000mah 15Amp and got them from 18650 battery store. I usually use li ion wholesale to get cells but they had no 18500.