1800battery basically is a 3rd party that locates private mechanics in your area to come change your battery. I read the reviews online so I was aware that the service typically runs 2-4 hours late. I also knew that 1800battery doesn't proactively let you know they are running hours late. So when my slotted time came I just called them and waited several minutes. I was very nice to the phone agent and he was nice and apologetic and told me they were indeed running 2 hours late. The mechanic was great and said that they told him the wrong battery but fortunately he had the right battery as well. Took 20 minutes. If you're in a rush or stranded you're better off calling roadside service. But if you have ~12 hours to wait and are in a position to do other things in the meantime 1800 battery is a good option. But expect potential mismatches with your battery and delays. And always be kind to the mechanic/service agents. They are not the problem.