Lost Vape is known for their classy and well-built mods and the Thelema Solo is no different. Using higher-end materials, the Thelema feels sturdy and luxurious in hand. The side battery door holds in a single 21700 (not included), however it does include a battery spacer for using your old 18650 batteries. Regardless of which battery you choose, you’ll be able to turn it all the way up to 100 watts.