A:AnswerYou can contact Sennheiser Hearing Support by phone, 1-866-435-5646, Monday to Friday, 8:00 to 4:30 Central Time (CST) or by email [email protected]. The support team can help you with anything from general inquiries to technical support. ~ SHS Support
A:AnswerIf I understand the question, you're asking if they can be charged with a battery bank? The answer is yes. They charge through the USB port and USB being 5V system, any standard USB port may charge the unit. I charge mine plugged into the USB port on my laptop sometimes.