The Colab Box  from Plan B Supply Co. Is now available this is a fully mechanical box mod batteries go in parallel (both batteries are facing the same direction) it is a 24 mm top. Recommend batteries are 21700 but if using 18650/20700 please use battery sleeves that are provided ***Product Is Packaged in Clear plastic book case by Manufacturer***Features:May be used in 18650/20700/21700 Parallel Both batteries go in the same direction L65*W29*H104mmBrass with silver plated contactsWeight 650 grams (just under 1.5 lbs) with Out batteries Batteries not included Included:1 x  Colab box mod 2 x  battery sleeves to use 186501 x  black caseAvailable Colors: Brass | Black | Black Red