the Reedy Krypton was new, tested 3 packs...
I swapped speedos and breaking was there... (I could lock the rear tires on
wet street)
my problem was that while wiring the car I switched the minus batt connection with minus motor (soldered motor to esc).
I NEVER made such an error before

Result: looks like i put
motor and esc in parallel (running in the Reedy with 7.2 Volts full throttle -
oh my...)
Of course I didn't see my fault and "tested" a couple of times, thinking
the (brandnew in box) speedo had an error.