how to build an electric scooter

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You need a FET speed controller between the battery and the motor, The speed controller will read a potentiometer and vary the motor speed. see:

Please post a link to a picture of your chassis.

donald

He doesn't need to get that complex. He just needs a pair of 6V batteries, a modest sized 12V motor, single pole double throw switch, some starter relays and a pair of pulleys with very different diameters.

He wants it to last a long time. This usually implies it needing to be very simple and over designed.

The double throw switch and relays is so that the batteries can be hooked in series or parallel: Ascii art

/ -------+-------/ O-------+-------------- To motor ! ! ! --- ! --- ! + ! ! ! + ! ! ! ! ! ! ! - ! ! ! - ! --- ! --- ! ! ! ! ! / ! / ! -------/ O-------+-----/ O---- GND GND

...

Heh - I had ass-u-med that he meant "battery life".

:-) Rich