Welcome to ECF. I am glad that you found something at a good deal, and that it has been working satisfactorily for you so far. A second battery and a second clearomizer (as backups) would be a good idea.
I have used eGo
batteries myself, and have found them to work very well. Personally, though, I have always tried to be sure - to the best that I could - that what I was buying were genuine Joyetech eGo
batteries. While I like a good deal as much as anyone else, with batteries I just have a thing about trying to stay with a major well-known brand - that's just my own personal preference.
As part of general battery safety, be sure to use the charger that comes with the batteries, or is the recommended charger for the battery, and also don't leave the batteries charging when you are not around to keep an eye on them.