So I have an electric polisher and I decided to buy one with a battery as well. Specifically, I got one with a 5Ah battery. It does an excellent job for polishing and waxing with sponges from Chemical Guys and polishes from Meguiars and Farecla. Just to give you an idea, I did two rounds of polishing to remove the light scratches and then waxed a 4.7-meter car, and the battery still seemed to have enough power for another round of polishing for a vehicle of the same size. It is also quieter compared to the electric polisher I have. For household use, it is truly the best. I polished three vehicles that we have in the family and I was completely satisfied with the result. I hope it has durability over time.