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L3V3L1,
How are you planning on doing that standalone charger? If you're thinking of connecting the wires straight up to the batteries (with no circuitry in the middle to regulate voltage and current) then you're sending 4.5v (if you're using 3 Alkaline AAs) at the highest current that the AA alkalines can chemically put out...Which i'm thinking is in the neighborhood of how the stock charger works on the Bits (so ~2,500mA).
It doesn't matter what voltage you use, the formula stays the same (time for charge is figured by amperage).
Use 2 batteries. While the 3 will work, you'd be sending more voltage than needed and could be detrimental to the batts.
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