We recommend you remove the battery from the helmet if you do not use it for 30 days or longer. The battery should never be drained down to zero, always keep the battery charged at a minimum of 1 hour.
When storing the battery, it’s important to keep it in the driest and coolest place in your home and never in the refrigerator or freezer. We also recommend storing the helmet in a dry and cool place as well and away from direct or indirect sunlight with or without batteries.
Here’s our blog article on how to maximize your Theradome battery life: https://www.theradome.com/maximize-theradome-battery-life/