One thing to consider is the RB5 really does not like to be down on weight in it's battery tray. My findings and that of several others is that if you run LiPo you need to weight the car back to NiMh weight to get it to go. Maybe that will change in time as more people do set-up work with them!
If your starting from scratch I'd say make sure you go for a charger that can do LiPo/LiFe/A123 cells so your a bit future proof but then go and buy some proper cells, just my opinion though.
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