This may be confusing, so bear with me please. A few weeks ago I bought a 650 mah eGo tank starter kit which I love. After 2 days one of the batteries quit working. It was fully charged and the button lit up when you pressed it but it wouldn't fire any of my atomizers. In the meantime I had ordered a few LR attys since the original kit came with regular ones. When the LR attys arrived, they would not work on the battery I had been using for over a week. When I got the replacement for the defective battery, it powered the LR attys. After a few days it also quit working with the LR attys. Today I got my second replacement battery and it is powering the LR attys without a problem. I wonder if it will continue to do so though. I have a 1000 mah eGo T starter kit on the way (from a different website) with LR attys already included so I hope they will work fine. I'm wondering though if the smaller batteries are not meant to run LR attys?