This ooze duplex battery works great. I have a few other ones (different brands) but this one is my favorite. It's strong and last long on one charge. You get nice smooth hits with large clouds and I like the dual quartz wax tank, it's so easy to use and I get plenty of hits with just a little bit of wax, crumble or shatter. I'm very happy with my purchase and I'm glad I got it, cause I really didn't need it. Would definitely recommend.