Amazon.com: Apc Universal Battery, 10WH: Electronics

These were on sale at Fry's for a while, but were discontinued, so they are out of stock there now. There are some other type that people have tried and like, so maybe someone else could steer you toward a cheaper one.

I vape so much I'm thinking of getting one of these:
Amazon.com: Rosco Alpha 900 Fog Machine with 30' Teathered Remote, 120v AC: Electronics