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You'll want a 3 volt adapter.
A 3v 120ma adapter would work, it'd probably just take a long time to charge.
If you get a 3 volt 800 ma adapter, it would probably take about 10 minutes to charge.
Basic equation:
V=IR
which is voltage=current*resistance
ma refers to milliamps, meaning 1000th of an amp
mah refers to milliamp hour, meaning capacity of a battery, that why the 200mah battery for bits gives a longer run time
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