The Nova Pro feature of providing a constant voltage charging circuit to protect the battery is continued on the Nova Pro 100. The AC adapter can be connected permanently without damaging the battery. The AC adapter input is protected against voltage reversal (if an adapter with negative tip is connected accidentally), and against a short time accidental connection of a higher voltage adapter up to 26 volts. A 9 volt AC Adapter with 300 milliampers of current capacity, positive inside mm connector is provided. A mm connector will also work, and a higher current rating is OK. Higher voltage adapters connected to the Nova Pro 100 for a long time however, will overheat the input regulator and may eventually burn it out.