I got a cheap hyper tough one at walmart. Have 2 batteries in the truck so i always have one fully charged. Charge them off a wall outlet powered by my inverter. 1 full charge will blow a reefer trailer out 2 1/2 to 3 times. I never sweep except to sweep up the mess on the ground so that I'm not littering.
Ya can even get ones that are a little bigger now at Walmart that look to be a little more powerful. They're that brand that is blu i think its hart or holt brand. Walmarts next generic brand after hyper tough.