Okay - maybe I grossly misunderstood what I thought I was ordering. Ordered a 510-801 adaptor to attach to my Ego batts so that I could order the Kanger 808 cartos (seeing as how the 510 Kangers were out of stock). Got it today, filled a Kanger carto, screwed everything together and ... nothing. Absolutely nothing. Is there any possibility that this connection does not work properly on an Ego battery and is meant for a 510 battery even though the threads are the same? There is no juice getting to that Kanger carto whatsoever.