we use lipo batteries in rc racing yes. they are great for that because we can run them all night at the track. multiple charges in one day. regular nicd or nimh batt could really only be ran once a night.
lipos are expensive, require a different charger (don't know how it would work with an alternator/ elec system of a vehicle) and they have a tendency to fire up. (as in, catch on fire) we have to charge them in a fire safe bag at the track.
for r/c use they are great, have great power potential and low weight.
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