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Ok, now we're going to talk about general care and maintenance. We'll start with the
batteries. There are four--basically--four different types of batteries for hearing aids:
675 blue, size 13 orange, size 312 brown, and size 10 yellow. The 675 is the battery
that we use in the larger unit, and it's fairly easy to change. You just open the door, take
the battery out, take the tab off the new battery, and put it back in. On the smaller
unit, it's the same process. It's just a much smaller door. The battery comes out and goes
back in. Batteries have to be changed every 70 to 150 hours, depending on the power of
the unit and the size of the battery that you're using.