If you are looking for teasonably priced disposable batteries, I would recommend the ones from
www.shopapexlabs.com. This is where some associates get their c cell cartridges from and they have never had a problem with them. I am not affiliated in any way and receive nothing from them other than complete satisfaction with all of their products. They even come in your choice of white, black, or silver. I believe that they are $9.99 each or if you order more they become less expensive. Have seen hundreds of these and only had one malfunction. Terp sauce? If you had that much finished product it sounds as if the concentrate was "runny". A solid concentrate shouldn't yield so much, at least in my limited experience. 1 gram of bho to 1 1ml of terpenes, such as from vapuer terp, are what I refer to as face melters. Keep up the experimentation and happy vaping.