“The charging device has to be plugged in to charge the hearing aids or is their a portable charger that can be used to charge them without it being plugged into a power outlet.”
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If 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.
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