This 'Power' Battery Flask Version 3 holds 2x 18650/20700/21700 batteries in two sizes, it's comfortable to carry around in your pocket, easy to use, stylish and was built because of the lack of safety many vapors simply deal with because of the few options available when it comes to battery cases.

18650-20700-21700 batteries are dangerous, re-wrap batteries that have nicks or plastic removed entirely from their casing, USE BATTERY CASES when carrying around ANY batteries in your pockets. Keys, change, anything metal can cause an extremely violent reaction when these batteries are not stored properly and can cause severe burns which you WILL go to the hospital for.

The lid and flask print together for simplicity purposes, the power symbol on the front is simply for aesthetics and usually prints just fine on the recommended settings. Arrow Notches were added on the side of the lid to give you a firm grip and also show you where to squeeze to open the case. No magnets or installation necessary, the lid and case friction fit together with a ball bearing style lock.

Can also hold two AA or three AAA batteries if need be.

Enjoy!

---No Printer? No Problem:
https://www.shapeways.com/product/BBFPUNZW9/power-battery-vape-flask-v3-18650-21700?optionId=105324012---

Disclaimer: I am not liable for any damages that may occur because of this design as this is just a pretty piece of plastic, use at your own discretion.

UPDATE: After using this design on a daily basis for over a month many who use this under various stresses and circumstances find it to be Extremely Durable and practically unbreakable.

UPDATE V3: 20700-21700 version added; Small inconsistencies with the lid ball lock mechanism were enlarged; Lip for battery entry was curved so lid slides on easier; Names & Logos have been removed to avoid printing issues; License is now public domain dedication, you are free to sell, buy, modify these design in any way you see fit.