As has been stated, the sleeve also houses the bottom cover plate, which protects the heater, actuator bar, and battery circuitry, and looks to be an integral part of the vaporizer. It could be used without the sleeve, but not worth the risk of damaging the vaporizer. The problem is my hands have very limited dexterity, and the sleeve would need to be removed whenever I wanted to replace or charge the battery, and every time I wanted to use it for the first time in the day, since I would either break the connection between the battery and heater or remove the battery at the end of the day. This leads to my conundrum since damaging the sleeve significantly could lead to making the vaporizer inoperable.