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huge gearedmotor

i have two geared motors but it isn`t small like normal geared motors that you use ,it`s huge ( in fact it`s a car with two geared motors one in each side ) ,so when i connect the two motors to  two 9v batteries in series it works very short time like a minute or something ,then the batteries is dead , what can i do ?????

please help.

 

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Loads of AA batteries in series(rechargeable if possible)

9v batteries are only good for things that draw little current. If the motors are rated to the voltage, try a 7.2v r/c type battery, you can draw a lot more current with them.