Ensure that you remove the front protective film from you Revitive Medic Coach, along with the small magnet and warning label. The magnet disables the battery for shipping purposes only, and you will not be able to use your Circulation Booster or charge it unless the magnet attached to the protective film is removed.
Once the film/magnet is removed, ensure your device is plugged into a power socket or that the battery indicator shows that it has sufficient charge.