I connected a manual 510 battery to my Ego-T atty today. It looks like a two-tone mushroom but I noticed a considerable ease when drawing. It seems that the two holes on the sides of the ego atty may not be allowing sufficient airflow when connected to the ego battery. At least with this set-up I'm not likely to burst an artery trying to get a decent vape with this otherwise disappointing e-cig IMO.