The high capacity Lithium-ion rechargeable battery pack provides power to the wireless Confidea units. Lithium-ion rechargeable cells have a long lifespan as they do not have charging degradation issues associated with other rechargeable battery types. The smart battery pack is monitored and controlled via a built-in microcontroller which monitors the recharging process and prevents overloading. Fully loading an empty battery takes about 4h and guarantees an autonomy of at least 20 hours typical use. Pushing a button on the bottom of the battery pack visualizes the remaining charge via a led bar.