Hi, Ben:
First of all, to answer your calibration question, press O with Spacebar,
(FUNTCION with O,) I with Spacebar, (READ with I,) and then press A for
accuracy.
From what I understand, the BrailleNote/VoiceNote batteries have a memory.
If you plug it in at high percentages, you won't be able to utilize it as
much. Usually, I don't worry until it get to 10 percent.
Many people believe it's better not to leave a card in the
BrailleNote/VoiceNote. It tends to drain the battery faster. I've always left
mine in, but am rethinking that.
Welcome to the list, and good luck./
