Jonson gear motors are heavily used in robotics purpose, machines etc. This gear motors works on 12 to 18v DC.

Purchase Link - https://www.myinnovation.in/product-page/10-500-rpm-12-24v-high-torque-gear-motor

Motor Specifications -

Motor Working Voltage- 12 - 18v

Motor No load Current Consumption - 0.4A

Motor Full load Current Consumption - 3A

Base Motor - 385 no 18000 RPM

Gear Ratio - 18:1

Shaft Dia - 6 mm D type

Torque - 2-3 kg.cm

Motor Diagram -