If you're just bashing or fun-running I suppose it doesn't matter what you use - but if you're talking about racing (or have plans to race) then the cost of of nimh batteries easily outcost that of the initial investment in lipo batteries/chargers. Many racers get by with just having a single lipo battery for their car, since they can be recharged multiple times a day with no harm or problem - while those using nimh packs have to have multiple packs just to get through a standard day (and they don't last nearly as long, lifetime, as lipos). And that's why, while it may appear nimh batts/chargers are a little cheaper initially (or for one pack/charger) that the longterm outlay is much more inexpensive over the longterm with lipo..
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