The mask has a built-in **500mAh rechargeable battery**. A full charge provides approximately **1 hour of use**, and charging takes about **3 hours**. The manufacturer does not currently specify the total battery lifespan in years or charging cycles. If the battery eventually stops holding a charge, please **do not open or replace it yourself**. Contact **service@freyara.com** with your order number and product details. Our after-sales team can check whether a replacement battery/controller or repair option is available, so you may not necessarily need to purchase a