I use my FaceTite Essential cordless, but at one point I needed to connect the adapter to continue my treatment. Surprisingly, the battery light did not turn on and the battery does not appear to be charging. Is this normal?
This is completely normal. When the device is in use, all the energy from the adapter is transferred directly to the operation of the product. This allows you to continue your treatment. When the device is turned off, the battery light will come on and your device will be properly charged for another wireless use.