Hey all,

I have an RC car that uses a 4.2 V battery pack (it's just 4 x 1.2 V
NiMH cells stuck together). I want to use 18650 (a little larger than
AA) or 14500 (AA sized) type Li-ion cells. They produce 3.7 V each, so
I'll be getting a much longer run time. However, since the motor needs
around 4.2 - 5 V, I need a way to boost the voltage. What are some
possible ways to do this? I havn't measured, but I would guess that
the motor doesn't use more than 10 A.

Would a DC - DC switching power supply be a good idea? It should be
relatively small (about the size of two AA batteries).
--=20
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