What were you running on it? One guy killed two Egos recently with Cisco 1.5 ohm atomizers. One member said 1.5ohm is a bit over the edge for the circuits in most mass-produced Ego-type (sealed in a shell) batteries and that cold weather can actually increase the problem.
I've looked at E-power - it seems sort of huge for me. I have plastic box mods (not real sturdy but functional). The BB at Altsmoke is one you might want to look at (also bigger and fatter than an Ego/Kgo but may be smaller than Vgo).
Here - browse through the the ecig mods database and "Browse by feature" is very handy
Best e-Cig Mod List | e-Cig Mods Database
And Super-T Manufacturing is a good place for batteries and chargers - I bought some batteries and they arrived super fast