Battery operated trike
Voltage Divider is not a good option as it will HUGELY consume current and most probably cause Fire Hazards. You can use a voltage regulator and choose one that supports 12 Volts. Try to choose one where the voltage conversion is in the low power range of the voltage regulator.

Another option is to use a DC/DC buck converters and there are options in the market ready for the specific voltage 72 Volts to Volts 12.

For example: https://www.powerstream.com/dc-72v-12v-5a-extreme.htm