Ya no doubt, i always use charger when i want to test my robo car. Well i have plenty of chargers like that.
But if you want to use it in any race then it won't help. Because it doesn't give that mush voltage and current to speed up the car.
So when i want to put robocar in race i just use parallel and series combination of small batteries. You can get more power for short time. and your car will run like sports car. he he.