Only downside with having 6 is keeping track of which ones are charged and which ones aren't. And being rigorous with keeping them as pairs. (not a problem if they are all different batteries.)
Also, you can't store them charged so if you break your car after 20 minutes, you've got 4 sets of batteries to discharge once you get home.......
And i use an RS16/eFuel charger (very shiny, but near enough 120 quid) and a 20A/300W Reaktor and a PSU from hobbyking. (which cost me about 60 quid all in)
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