What is the input voltage of the VOLT MAX charger? May 19, 2022 18:43 Updated The input voltage of the VOLT MAX is DC 5V. Related articles Does the VOLT MAX charger work with a 220-240V outlet? Which program should I use with my VOLT MAX? Is the MDHearing app able to stream music/TV to the hearing aid? Why isn't the MDHearing app connecting to my hearing aid? How do I charge the VOLT+?