There's also Joye ego-t 18650 Mod Battery if you don't like the e-Power. It is new so there hasn't been a chance to see how they hold up long term, but Joye is generally well thought of. This is not the complete kit however. You'd need to get batteries and a charger. It is also quite a bit bigger than any regular eGo, but battery life could be at least twice what you'd get out of an 1000 mAh battery. FWIW, I've never tried one of these; just trying to inform you of your options.