Hi and thank you for using Just Answer
In reading your note, I'm sorry to say that there is no battery in your appliance. I tried to look up your unit, but the model number you provided didn't revile anything. So if you can, please double check and let me know. I do know that some of these appliances do have volume control. Maybe on a off chance this was changed ... If there is anything else I can help you with please let me know. I'm going to move this to Q&A so we can have more time to pursue this if you would like. Please follow the instructions provided. I wish you the best.
The full model number is ***** Type: FGKST 75 ZB TE.
There does not seem to be a volume control.
Thank you. We will get along without it!