LiPo are 8.4v fully charged, more importantly, they barely dip at all under load. A nimh may dip a couple of volts under load.
The discharge curve is also very flat. You'll get 10+ minutes from a Lipo with almost no loss in performance, more in a light 2wd.
Auto brake will be unaffected by turning the end points down.
A brushless motor will last almost indefinitely compared to a brushed motor. And requires virtually no servicing, just a blast with compressed air if it gets dirty and a drop if oil on the bearings once in a blue moon
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