My electric scooter recently had a problem where it suddenly wouldn't accelerate and drive maybe 20km/h max - similar to what happens if the battery is very low (though it wasn't).
Today I did the computer person thing: Disassemble, and then pull and reseat any available connection.
Seems to have helped for now, no problem during a 25km test drive, with either of the batteries.
I'm sure the problem will reappear at the worst possible time
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