Habit I guess -- Calibre seems to default to the SD card. I'm considering revamping that one of these days.
Your 5V phone charger is fine ... from another thread here:
I have the (official Sony) adapter. It says the following:
Sony PRSA-AC1
INPUT:100V-240V~
______50/60hz 0.2A
OUTPUT:5V — 1500mA
TYPE:ACC-211UC
Etienne66
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