I bought this because we were working on a painting project where I was moving up and down several (4) levels of scaffolding, sanding wood paneling and window sills and I was tired of wrestling with the cord. This works great with a full 5Ah battery, maybe an hour then it starts to fall off. The only reason I didn't give 5 stars is that it's not as powerful as the wired model and therefore grinds a bit slower. It has 3 speeds but for what we do I only used the highest one. I think the compromise of not having a cable is worth it in an application like this.