does that happen a lot w spares?
My kit contained two 650s. I've since ordered two 900s, or 1000 as promoted as Tornado. Of the four ... two were DOA, one 650 and one 900. One uncertainty, one of the 900s was ordered by me for a newbie vaper. The symptoms he reports make it sound DOA, but I haven't tested it out myself. He will give it to me on Monday so I can check it out. There is a possibility that he is making some newbie'ish mistake, but it doesn't sound like it.
I don't mean to discourage you. Just a heads up for that possibility. Any manufactured item can be defective. I love them myself. Even the 650 is an all day battery for me.
Oh, one other note: You can't charge the eGo battery with a standard 510 charger alone. You'll need an adapter. They cost $4.00.