Based on your comments, it seems your problem is not so much with the eGo (i.e., the battery), but with the atomizers you're using on that battery ... or, perhaps, with how you are using them. Dripping
e-liquid directly on the atomizer coil works very well, but requires frequent (albeit easy) effort. Trying to use cartridges tends not to be very effective.
As for the atomizers themselves, those that came with your eGo kit are just one type that can be used. Perhaps others here can recommend alternatives.
I prefer
cartomizers (i.e.,
integrated cartridge and atomizer). They don't last longer than atomizers (perhaps even less), but they are much less expensive (e.g., a five-pack costs about the same as one atomizer). More important to me is that cartomizers more effectively deliver
e-liquid to the atomizer component than do cartridges.
There are many types of cartos as well. The Boge 2.0 and
smok Tech Mega Dual Coils are very popular and are available from a great many suppliers. But my favorite is the Smok Tech 1.7 Mega
Single Coil cartomizer nicknamed 'Resurrector' by
Crystal Clear Vaping and 'ReJuvenator' by
SmokTek, because it brings new life to the relatively low voltage eGo.