How long do the batteries last?

The batteries have been timed to last for 50 hours, using 2 x D type batteries. So each motor will run independently for 50 hours, which if a barbecue lasts for 2 hours, will run for 25 barbecues. However if you use a high quality battery like Duracell, we have found the batteries last much longer – between 80 to 100 hours.